Illustration of the different cases of consecutive blocks of identities or non-identities (CBINs). (A) CBIN of matches, (B) CBIN of gaps (counted as mismatches), (C) CBIN of mismatches, (D) example of a comparison of two sequences with an alignment length of 32. Matches are denoted by "|", mismatches by "#" and amino acids aligned to gaps by ":". The example alignment of length 32 features eight CBINs. The values of the three features are: (i) sequence similarity 0.594, (ii) inverse CBIN count 0.125, (iii) fraction of consecutive matches and mismatches 0.75.