Amino acid sequence alignment of the members of the SAP30 family. Naming of the sequences is presented in Table 1. The residues in the alignment are shaded light grey, grey, or black to indicate shared identity at 40%, 70% and 100%, respectively. The arrows indicate the zinc coordinating residues. PIP = Phosphatidyl Inositol Phosphate, NLS = Nuclear localization signal, Acidic region = a central region contributing to histone/nucleosome binding, NoLS = Nucleolar localization signal, SID = Sin3 interacting domain.