FIG. 1.

Alignment and secondary structure prediction of P2 Cox, HP1 Cox, and 186 Apl proteins. Asterisks symbolize amino acids that are identical between the proteins. Uppercase letters in the consensus sequence signify that the amino acid is identical in all three proteins, while lowercase letters mean identity between two of the proteins. The boxed amino acids refer to the exchanged amino acid in the different cox mutants listed above. The consensus secondary structures are shown below. Arrows symbolize β-strands, and barrels symbolize α-helices.