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1 February 2-25, RNA Spring Project Basic Theories for Bioinformatics Lecture Note I Motomu MATSUI Institute for Advanced Biosciences Keio University, Japan qm at sfc.keio.ac.jp
2 Basic Theories for Bioinformatics Lecture Note I by Motomu MATSUI 203/0/20 ver /02/0 ver /02/08 ver /02/4 ver. π Copyright by Motomu MATSUI
3 LECTURE -Introduction- LECTURE 2 -Clustering- LECTURE 3 -Spectral clustering- LECTURE 4 -Statistics- LECTURE 5 -Phylogenetics-
4 LECTURE 6 -Spectral Phylogenetic Analysis-
5 Nothing in Biology Makes Sense Except in the Light of Evolution - Theodosius Dobzhansky (900-75) a. b. a. b. c. E-value...BLAST a. b. c.
6 google tχ... [ ]. (2007) R,. 2. Rui Xu and Donald C. Wunsch II (2009) CLUSTERING, IEEE. 3. (966),. [ ] 4. (2003) R,. 5. Derek A. Roff (20),. [ ] 6. (988),. 7. and Sudhir Kumar (2006),.
7 8. Ziheng Yang (2006),. 9. (997),. 0. Ian Korf, Mark Yandell and Joseph Bedell (2003) BLAST, O REILLY.. David W. Mount (2004) Bioinformatics, Cold Spring Harbor Laboratory Press. [ ] 2. Jianbo Shi and Jitendra Malik (2000) Normalized Cuts and Image Segmentation, IEEE Transactions on Pattern Analysis and Machine Intelligence, 22(8), Chris Ding, Chris H. Q. Ding, Xiaofeng He, Hongyuan Zha, Ming Gu, Horst Simon (200) A Min-max Cut Algorithm for Graph Partitioning and Data Clustering, In Proceedings of the first IEEE International Conference on Data Mining (pp.07-4). Washington, DC, USA: IEEE Computer Society. 4. Motomu Matsui, Masaru Tomita, Akio Kanai (203) Comprehensive Computational Analysis of Bacterial CRP/FNR Superfamily and its Target Motifs Reveals Stepwise Evolution of Transcriptional Networks, Genome Biol. Evol. 5(2), Hirotsugu Akaike (973) Information theory and an extention of the maximum likelihood principle, Proceedings of the 2nd International Symposium on Information Theory, Petrov, B. N., and Caski, F. (eds.), Akadimiai Kiado, Budapest, Newman, MEJ (2006) Modularity and community structure in networks. PNAS 03(23), G Palla, I Derényi, I Farkas, and T Vicsek (2005) Uncovering the overlapping community structure of complex networks in nature and society: Nature 435, Pellegrini M, Marcotte EM, Thompson MJ, Eisenberg D, Yeates TO (999) Assigning protein functions by comparative genome analysis: protein phylogenetic profiles. PNAS 96, Paul Erdös and Alfred Rényi (970) On a new low of large numbers. J. Anal. Math 22, Samuel Karlin and Stephen F. Altschul (990) Methods for assessing the statistical significance of molecular sequence features by using general scoring schemes. PNAS 87, Richard Arratia, Louis Gardon and Michael Waterman (986) An extreme value theory for sequence matching. Anal. Stat., 4,
8 (clustering)(classification) [Classification] ( ) [Clustering] Fig.-Classification Clustering ( ) ( )
9 2.2 クラスタリング手法の 分類 クラスタリング手法には様々なものがありますが 大まかには以下のように分類する事 ができます (もちろん複数の分類にまたがるような手法もたくさんあります 例えば Newman法は大域アプローチでしたが 局所アプローチに立った改良もされています ) ① ボトムアップ vs トップダウン 似ているもの同士を結合してクラスターを形成する作業を再帰的に繰り返すことで 最 終的には一つのクラスターまでまとめあげる事ができます この方法を ボトムアップ ア プローチと言います 逆に全体をまず一つのクラスターと考え それを複数に分割する事 でサブクラスターをいくつか得る方法を トップダウン アプローチと言います [ボトムアップ] 階層クラスタリング Markov Cluster Algorithm (MCL) K-クリーク法 [トップダウン] K-meansとその派生 スペクトラルクラスタリング 混合分布モデル Fig.2-Bottom-up, Top-downアプローチの比較 ② 大域 vs 局所 要素の集合全体を対象としてクラスタリングを行うのが 大域 アプローチです 要素数 が限られている場合はこれに属する方法のいずれかを行うべきでしょう 一方で 解析対 象が大きすぎる場合は個別の要素に着目して その周辺の要素のまとまり方からクラスター を決定する近似的手法が採られます それを 局所 アプローチと言います [大域] 階層クラスタリング K-meansとその派生 スペクトラルクラスタリング [局所] 以下の二つを始め ネットワーク理論に基 く多くの方法は局所アプローチに属します K-クリーク法 MCL Fig.3-Local, Globalアプローチの比較 9
10 vs [] Fuzzy c-means [] K-means * f g Fig.4-Hard, Soft f g (norm) f : e f = e f e f2 e fn g : e g = e g e g2 e gn Fig.5-
11 (L norm) d fg = c e fc e gc (L2 norm) d fg = c (e fc e gc ) 2 Σ dfg=-rfg rfg rfg 2 absolute/squared correlation egc egc d fg = (e f e g ) t (e f e g ) r gf = c (e fc e f )(e gc e g ) c (e fc e f ) 2 c (e gc e g ) 2 Fig.6-
12 cos( )= c e fce gc c e2 fc c e2 gc * X Y sim(x, Y )= X X Y Y (Mutual information; MI) X Y H(X) X H(X,Y) X Y H(X) X=iPi MI(X, Y )=H(X)+H(Y ) H(X, Y ) H(X) = i P i log P i 0/
13 2.2 Tab.- e.g. (K)... overfitting ()( )
14 (UPGMA)( UPGMA ) ( ) ( ) (UPGMA) Fig.7-
15 K-means K-means Fig.8 Kernel K-means K-means Kernel Kernel K-means K-means Kernel x-means KK-means AIC Fussy c-means K-means K Fig.8-K-means.K( ) 2. ( ) ,36.
16 (MCL) K-means Web MCL2000 Fig.9-MCL ( ) MCL Newman Newman 2.5Q K- K-K K- 3.
17 A A... A C x x2... xk C x2 x22... x2k C xk xk2... xkk C, C2,..., Ck K A, A2,..., Ak K xp,q p=qp q TRUE FALSE Predicted True TP FP (α error) PPV Predicted False FN (β error) TN NPV Sensitivity Specificity (Sensitivity) (Specificity)(Accuracy) -Specificity xsensitivity y ROC Sensitivity = Specif icity = TP TP + FN TN TN + FP
18 P ositive predictive value = N egative predictive value = Accuracy = TP TP + FP TN TN + FN TP + TN TP + TN + FP + FN (entropy)(purity) Ei Pi i Ci entropy = E i = purity = K h= P i = max h K i= K i= = N Ci N E i Ci N P i K i= max h C i A h P (A h C i ) log P (A h C i ) C i A h C i
19 Fig.0-/ Newman p q epq ai 2 Q Q = i (e ii a 2 i ) (AIC) (BIC) AIC = 2lnL +2k BIC = 2lnL +2kln(n) Ln k
20 Fig.- (A) G W (B) A,B a b Fig. sim(a, b) sim(p, r) =0.6
21 ABW(A,B) W (A, B) = sim(a, b) a A,b B Fig. W (A, B) = sim(a, b) AW(A) a A,b B = sim(p, s)+ sim(r, t) =0.3 W (A) =W (A, A) d A = W (A)+W (A, B) da G A,B Mcut Ncut Mcut = Ncut = W (A, B) + W (A) W (A, B) + d A W (A, B) W (B) W (A, B) d B Mcut, Ncut McutNcutA B Mcut Ncut
22 Ncut 3.2 Ncut Mcut Ncut W,Dq3.3 W D q OK q ; qa GA -b GB p q r s t u z X W... D = diag(we) q... q =(a, a, a, b, b, b) W (A, B) Ncut = + d A =... =... =... = qt (D W )q q t Dq G (N N ) a -b N W (A, B) d B z = D 2 q X = E D 2 WD 2
23 Ncut Ncut = zt Xz z t z Ncut = zt Xz z t z R X (z) = zt Xz z t z RX(z) X 2... n z,z 2,..., z n = R X (z ) R X (z 2 )... R X (z n )= n
24 . G W 2. X X = E D 2 WD 2 3. X (, ) λ2 (Fielder )z2 (Fielder ) ( ) 4. q q = D 2 z q( a) G A ( -b) GB ( ) (K-means MCL) ( ) ()
25 & & Fig.2- ( ) Fig.2a,b θ a,b a = a a 2 b = b b 2
26 ka = ka ka 2 a ± b = a ± b a 2 ± b 2 a() a a = a 2 + a2 2 a b = a b + a 2 b 2 ( ) (a,b) ( ) a,bθ Fig.3- a b θ c
27 c 2 =(bsin ) 2 +(a b cos ) 2 = b 2 sin 2 + a 2 2ab cos + b 2 cos 2 = b 2 (sin 2 + b 2 cos 2 )+a 2 2ab cos = a 2 + b 2 2ab cos a,b,c a, b a = a a 2 b = b b 2 a = a 2 + a2 2 b = b 2 + b2 2 c = b a = (b a ) 2 +(b 2 a 2 ) 2 cosθ c 2 = a 2 + b 2 2 a b cos cos = a b + a 2 b 2 a 2 + a2 2 b 2 + b2 2 a b cos = a b a b
28 θ a b = a b + a 2 b 2 = a b cos Fig.4- cosθ=0 0 0 ( cos sin )
29 ax + by = X cx + dy = Y x = ad bc (dx by ) y = ad bc (ay cx) (ad - bc 0 ) a c b d x y = X Y ( ) ( ) ( ) 4 x y = ad bc d c b a X Y A = a b c d
30 A x y = X Y A = ad bc d c b a x y = A X Y p = q p = q A A - AA = a b c d = ad bc = 0 0 ad bc d c ad bc ab ab cd cd ad bc b a EA E E = 0 0
31 AE = a b c d = a b c d 0 0 E E ( ) E A EA - A A - A A A E x y x y x y x y = X Y = A X Y = A X Y = A X Y. E N n I( ) ( ) E n = O O N
32 2. A - A X A A - A - A ( A =0 ) 3. A A AX = XA = E A = a b c d A (det(a) ) A = ad bc A - A = A A - A 0 4. A t A d c b a A = a b c d e f g h i A A t t A t = a d g b e h c f i
33 5. ( ) A = a b c A = A x = (2, 0) t Ax = = 2 2 Fig.5-
34 ( (,0) (0,)) (2,0) (2,0) x(2,0)a x (2,2) p q (x-y=0 x+3y=0 ) p = (, ) 2 q = (3, ) 0 x p5 q9 x+3y=0(3,-)a A 3 = = 5 5 x+3y=0 q5 x+3y=0 x-y=0 Ax = x x x+3y=0 x-y=0 λ (5 9) λ x A p q p q λ xp q (A E)x =0 x=0 x 0 X=(A-λE) X -
35 x 0 X - λ λ x x=(x,x2) λ=5 λ= Xx =0 X Xx =0 x =0 A E = =0 =0 (6 )(8 ) 3=0 ( 5)( 9) = x =0 x =0 x +3x 2 =0 =5, 9
36 A Fig.5A λ Ax A Fig.5 3. p,q 2. 3.(,0) (0,) x =0 x =0 x x 2 =0 Ax = x. p,q ( )
37 Fig.6-(3- ). V E G=(V,E)V(note, ) E (edge, )Fig.6 V( ) E (-) 2. Vx,y {x,y} Ex y x~y x y 3. G=(V,E)x E xdeg Fig E {{x, y} ; x, y V,x = y} deg G (x) = {y V ; y x}
38 G=(V,E) G =(V,E ) f: V V x y f(x) f(y) G=(V,E) G =(V,E ) g = g f Fig Fig.7- SNS
39 5. G=(V,E) a xy = if x y 0 if x y A=(axy) G=(V,E) G=(V,E) V={,2,3,4,5,6} E2={{,2},{,3},{,4},{2,3},{3,5},{4,5},{4,6},{5,6}} G A Fig.8-G A = (0) 6 e6 A A e 6 = =
40 A A 2 = = A 3, , 4... A 6. () G2=(V2,E2) V2={,2,3,4,5,6} E2={{,3}, {2,}, {3,2}, {4,}, {4,5}, {4,6}, {5,3}, {5,6}} G E2 {,3} 3 3
41 Fig.9- G2 G2 A2 A 2 = A 2 e 6 = = A t 2e 6 = =
42 A 2 2 = = G up :-) 7. G3=(V3,E3)V3={,2,3,4,5,6} E3={{,2},{,3},{,4},{2,3},{3,5},{4,5},{4,6},{5,6}} Fig.20- G3 SNS
43 G3A A3.0 A 3 = A 3 e 6 = = ,2,3C A = = C
44 3. Ncut... f(x, y) =ax 2 + bx 2 + cxy f(x, y) =ax 2 + bx 2 + cxy =(x, y) = x t Ax a c/2 c/2 a x y (x, y) a c/2 c/2 a x y = ax + c 2 y c 2 x + ay x y = ax 2 + c 2 xy + c xy + ay2 2 = ax 2 + bx 2 + cxy OK A = a c/2 c/2 a f(x,y)( a-a ) ( c )
45 A N N λ, λ2,..., λnz, z2,..., zn ( z = z2 =,..., zn = ) R R = z z 2... z n R AR = O O 2... n O O 2... n n = n O n 2 O... n n O O 2... n = 2 O... O n O t O O 2... n = O 2... n
46 () O O 2... n 3.3 R A R 2 = 2 O 2 2 O... 2 n R = z z 2... z n A R λi zi AR = A z z 2 z n = Az Az 2 Az n Az i = i z i Az Az 2 Az n = z 2 z 2 nz n = z z 2 z n 2 n = R 2 n
47 AR = R 2 n R - R AR = R R 2 n = E = O 2 n O 2 n ( )
48 3. X λ λ2... λn z, z2,..., zn R X (z) = zt Xz z t z = R X (z ) R X (z 2 )... R X (z n )= n z, z2,..., zn z z2 λ λ2 λ λ2 Az = z Az 2 = 2 z 2 (z,z 2 )=( z,z 2 ) =(Az,z 2 ) =(z,a t z 2 ) =(z, Az 2 ) =(z, 2z 2 ) = 2 (z,z 2 ) ( 2 )(z,z 2 )=0 (z,z 2 )=0 λ, λ2,..., λn z = z2 =,..., zn =
49 N Nx c, c2,..., cn RA(x) R A (x) = xt Ax x t x wi x = c z + c 2 z c n z n = (c z + c 2 z c n z n ) t A(c z + c 2 z c n z n ) (c z + c 2 z c n z n ) t (c z + c 2 z c n z n ) = (c z + c 2 z c n z n ) t (Ac z + Ac 2 z Ac n z n ) c 2 + c cn n = (c z + c 2 z c n z n ) t ( z c + z 2 c n z n c n ) c 2 + c cn n = c 2 + c n c 2 n c 2 + c cn n = n i= ic 2 i n i= c2 i w i = c 2 i /(c 2 + c c 2 n) 0 R A (x) = n i= iw i n i= w i = RA(x) wn= wi=0 (i=,...,n-) max R A (x) =R A (z n )= n
50 RA(x) A A λn λn-... λ maxmin = max R A (x) = max R A (x) max f(x) = min f(x) min R A (x) =R A (z )= = R X (z ) R X (z 2 )... R X (z n )= n
51 3. Ncut Jn = qt (D W )q q t q Jn Ncut Ncut = Jn Jn 3. Jn = zt Xz z t z Ncut = JnNcut Jn W W = d d 2 d n d 2 d 22 d 2n d n d n2 d nn N Ndij i j e = N e D D = diag(we) diag N N N D
52 d i = j d ij di d O D = d 2 O dn q a -bn a b a = b = d B d A d d A d B d d X = i X d i i Aa i B-bJn Ncut d = d A + d B Ncut = W (A, B) d A + W (A, B) d B Jn q t Wq = a 2 W (A)+b 2 W (B) 2abW (A, B) aw (A) bw (B)+(a b)w (A, B) =0 W (A, B) = qt (D W )q (a + b) 2
53 q t Wq = a 2 W (A)+b 2 W (B) 2abW (A, B) Wq i N j= d ij q i q a -b N j= d ij q i = a N d ij j A b N d ij j B = ad (i) A bd (i) B da (i) i A q t Wq = N i= (ad (i) A bd (i) B )q i = a N i= (ad (i) A bd (i) B ) b N i= (ad (i) A bd (i) B ) = a 2 d A abw (A, B) baw (A, B)+b 2 d B = a 2 d A + b 2 d B 2abW (A, B) aw (A) bw (B)+(a b)w (A, B) =0
54 aw (A) bw (B)+(a b)w (A, B) = a(w (A)+W (A, B)) b(w (B)+W (A, B)) = a d i b d i i A i B = ad A bd B a = b = d B d A d d A d B d ad A bd B = d A d B d A d d B d A d B d = d2 A d B d A d d 2 B d A d B d =0 W (A, B) = qt (D W )q (a + b) 2 xi x i = q i a b 2 2 a + b x i = if q i = a if q i = b
55 (x i x j ) 2 = 0 if x i = x j 4 if x i = x j W(A,B) W (A, B) = 2 ij (x i x j ) 2 4 d ij xi(xi - xj) 2 (x i x j ) 2 = q i a b 2 = 4(q i q j ) 2 (a + b) 2 2 a + b q j a b 2 2 a + b 2 W (A, B) = 2 ij (q i q j ) 2 (a + b) 2 d ij = 2 ij q 2 i 2q i q j + q 2 j (a + b) 2 d ij = q 2 i d ij 2 q i q j d ij + q 2 j d ij 2(a + b) 2 i j i j j i = q 2 i d i q i q j d ij (a + b) 2 i i j Dq i diqi Wq j Σjdijqj W (A, B) = (a + b) 2 (qt Dq q t Wq) = qt (D W )q (a + b) 2
56 Ncut Jn aw (A) bw (B)+(a b)w (A, B) =0 a(w (A)+W (A, B)) = b(w (B)+W (A, B)) ad A = bd B W (A, B) = qt (D W )q (a + b) 2 (a + b) 2 W (A, B) =q t Dq q t Wq q t Wq = a 2 W (A)+b 2 W (B) 2abW (A, B) (a + b) 2 W (A, B) =q t Dq a 2 W (A) b 2 W (B)+2abW (A, B) (a 2 +2ab + b 2 )2W (A, B)+a 2 W (A)+b 2 W (B) 2abW (A, B) =q t Dq a 2 (W (A)+W (A, B)) + b 2 (W (B)+W (A, B)) = q t Dq a 2 d A + b 2 d B = q t Dq ad A = bd B a(a + b)d A = q t Dq
57 Ncut = W (A, B) d A + = W (A, B) = W (A, B) Ncut=JnJn D W (A, B) d B + d A d B d A + = W (A, B) a + b ad A = qt (D W )q a(a + b)d A = qt (D W )q q t Dq = J n J n = qt (D W )q q t Dq = qt D(E D W )q q t D 2 D 2 q = qt D 2 (E D 2 WD 2 )D 2 q q t D 2 D 2 q a b d A = D 2 q t (E D 2 WD 2 ) D 2 q D 2 q t D 2 q z = D 2 q X = E D 2 WD 2
58 zx X λ0 Ncut B Jn = zt Xz z t z Fig.2- W(A,B) = 0λ=0 Fielder Fielder Ncut 3. () Mcut Ncut Mcut Mcut
59 a. () ( ) ( )...tuχ ANOVA ( ) ()... b. ( ) ( ) (LOESS ) ( SVM ) ( K-means )
60 . [ ] : : {,2,3,4,5,6} : 5,6,3,,3,5,6,,2,3,5,,6,4,2,4... ( ) [ ] : :. {A,B,...,N } : ( ) Crand R = Blum- Blum-shub s 2 s 2 μσ 2 x E(ˆµ) =µ ˆµ ˆ2 E(ˆ2) = 2 x
61 s 2 x,x2,...,xn x E(s 2 )=E n n i= = n E n = n = n = n = n n i= n i= n i= n i= i= = 2 2 x (x i x) 2 (x i x) 2 E(x) =E E(x) =µ E(ŝ 2 )= 2 n n i= = n E n = n nµ = µ E (x i x µ + µ) 2 E ((x i µ) (x µ)) 2 E (x i µ) 2 2(x µ) n E (x i µ) 2 E (x µ) 2 n i= n i= x i x i E [x i µ]+ n n i= E (x µ) 2
62 s 2 u 2 = n s2 u 2 σ 2 u 2 n- 3. Fit μσ 2 f(x) = 2 e (x µ) ( )
63 ( ) X,X2,...,Xn µ = E(X i ) 2 = V (X i ) i =, 2,,n 4 = E(X i µ) 4 Pr lim n X + X X n n = µ = lim n X = µ ( ): X,X2,...,Xn µ = E(X i ) 2 = V (X i ) i =, 2,,n Y Y = n(x µ) lim n n(x µ) = 2 e x 2 2 dx
64 t Fχ 2 tfχ 2 Fig.22- F F: F : FF : t 2. ANOVA... t: t : tt :. Student t Welch t... χ 2 χ 2 : χ 2 : χ 2 ( ) χ 2 :
65 vs tt = U (=Wilcoxon) t t t ( ) ( ) α t F F
66 t Ft Welch t Welch t [ ] Z 2tWelch t FANOVA [] 2Wilcoxon( )= U ( ) ( )= ( ) χ 2 = [ ] t 0.05 () tulsd OK HSD (R) k α α/k α/k α=α/k, α2=α/(k-),..., αk=α iαi
67 BLAST E E BLAST E 0,000 (= ) 9,999 9,999 E 9,999P E E P E=0.05 E=0-0 E=0-00 E E-0 E-00 E-0E E? E-0 E E E e -0 E-0 E E e 0 = eeeeeeeeee E 0 = E D ahoo E
68 BLAST E S Fig.23-BLAST(Korf I et al., BLAST ) E. ( ) 970 pn Rn p nnp 2 np 2 3 np 3...i np i l np l = R n log p (n)
69 np l = 2. p l = n log p p l = log p n l = log p n m n M M = log p (mn) Arratia Waterman E(M) = log (mn) + log (q)+ log (e) p p p 2 log p Var(M(m, n)) (e) γ= () q=-p ( Attatia (986) ) E(M) E(M) log e (Kmn) λ=loge(/p) K M S E(S) = log e(kmn)
70 3. P xs x(x>>e(s))x S x n P n = e x x n n S x S x S x S-E(S) c x=c+e(s) P 0 = e x P 0 = e x P (S E(S) c) = e pc P (S x) = e p(x E(S)) = e px ln(kmn) = e p ( x ln(kmn)) = e p ( ln(kmn)e = e Kmne x P x ) =ln p e = p P = e
71 lim x e e x e x x>2 P (S x) Kmne x P S S = S ln Kmn P (S x) e x Bit score = S ln(2) S 2 E 4. E E S f(s) = e S S x P (S x) = x f(s) = = e x x e S ds S x (Kmn)
72 E(x) =Kmne S x Kmn E PE P (x) = e E(x) x P(x) E(x) P (x) E(x) 5. P P. 2. α 3. - α ( P )
73 Yev Y ev = e x e x P(S<x) Yev - x P (S <x)=e e x P(S x) P(S<x) x u Su=E(S) P P (S x) = e e x X = (x u) P (S X) = e e (x u) = e e (x log e (Kmn) ) = e e x+log e (Kmn) = e Kmne x Fig.24-: (μ=0,σ 2 =) : (μ=0,η=)
74 (...) BAP(A B) P (A B) = P (A B) P (B) B ( ) A B ( ) B A P(A) P(A B) B *cap A B cup A B A B D n (H,H2,...,Hn) HiL(Hi) Hi L(Hi) Hi D D L(H i )=P (D H i ) P (A B) =P (A B)P (B) A B P (B A) =P (B A)P (A)
75 P (B A) =P (A B) P (A B)P (B) =P (B A)P (A) P (A B) = P (B A)P (A) P (B) P(D Hi ) P(Hi) HiP(D) D P(Hi D) D HiHi P(D) Hi Hi P(D) P (H i D) = P (D H i)p (H i ) P (D) P (D) =P ((D H ) (D H 2 ) (D H n )) = = n i= n i= P (D H i ) P (D H i )P (H i ) P (H i D) = P (D H i )P (H i ) n i= P (D H i)p (H i )
76 : P(D Hi) : P(Hi D) (Hi) : P (H i D) = P (D H i)p (H i ) P (D) P(Hi)/P(D)
77 () DNA DNA a. ( ) b. DNA ( ) c. DNA ( n DNA4 n ) in/del ( ) : DNA BLAST, FASTA, SSearch( ) NP (Clustal, Muscle, Mafft, T-coffee... )
78 NJ ( ) internal outgroup : : - 3 () : : () ( )
79 : : : 6S/8S rrna : : : e.g. 6S rrna Hox : e.g. : :
80 (α) (a t c g)(β) (A) Jukes-Cantor (B) 2 Jukes-Cantor (C) - Jukes-Cantor ( ) 2 (D) Fig.25- (α)(β)
81 Tab.2-α βgi (Nei et al., 2006 ) Tab.3-BLOSUM62. A R N D C Q E G H I L K M F P S T W Y V B Z A R N D C Q E G H I L K M F P S T W Y V B Z a,b,c
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