Fig. 1.

Structures and relationships of Tetrahymena Hp1-like proteins. a) Relative size of the proteins and positions of chromo domains (“CD”, dark gray boxes) on each protein. Chromoshadow domains are represented with light gray boxes and “CSD”. Letters in dark gray boxes represent the CD subtype using the previously published letter designation (Tajul-Arifin et al. 2003). b) Phylogenetic relationships between HMM models for CD subtypes. Box includes the subset of CD subtypes found on Tetrahymena proteins. c) Phylogenetic relationships between CD sequences on the Tetrahymena proteins. The CD closest to the amino-terminus is denoted “CD1” the other (if applicable) is denoted “CD2”.