Example: do protein fragments (9 amino acids) share common structure? (Plastocyanin)
D 2.1 2.5 3.5 0 - - - - -
E 3.3 3.5 3.6 2.8 0 - - - -
F 2.0 2.8 4.4 2.2 1.9 0 - - -
G 4.5 4.4 3.2 4.1 3.3 3.3 0 - -
H 2.3 2.8 4.4 2.5 2.3 3.7 2.7 0 -
I 3.7 3.5 3.4 4.4 4.7 4.4 3.8 3.2 0