A

0.05702

0.007187

0.42

R

0.58946

0.043587

1.37

N

0.22972

0.005392

0.82

D

0.21051

0.023820

1.05

C

0.14907

0.036610

1.34

Q

0.34861

0.049211

0.30

E

0.32837

0.006802

0.87

G

0.00279

0.179052

0.00

H

0.37694

0.010690

0.18

I

0.37671

0.021631

2.46

L

0.37876

0.051672

2.32

K

0.45363

0.017708

1.35

M

0.38872

0.002683

1.68

F

0.55298

0.037552

2.44

P

0.22790

0.239531

0.98

S

0.09204

0.004627

0.05

T

0.19341

0.003352

0.35

W

0.79351

0.037977

3.07

Y

0.61150

0.023599

1.31

V

0.25674

0.057004

1.66

ose the initial data set of the 20 amino acids is denoted by

ࣞൌሺA, C, D, E, F, G, H, I, K, L, M, N, P, R, Q, S, T, W, V, Yሻ

e 2.17 shows a hierarchical clustering tree generated for this

id data set. In this hanging tree, it can be seen that the amino acids

were the first pair of the amino acids to be merged from ࣞ because

the least distance compared with all other pairs of the amino acids.

n descriptor vector of the amino acids R and Y, which was ωୖଢ଼,

rted into ࣞ. After the merge of the amino acids R and Y, ࣞ had

wing structure, where

ino acids R and Y,

ωୖଢ଼ represents the mean descriptor vector

ࣞൌሺA, C, D, E, F, G, H, I, L, K, M, N, P, Q, S, T, W, V, ωୖଢ଼ሻ