Alignment of the amino acid sequence of Cdc25A from BALB/cJ, C57BL/6J, rat, and human.

The dark box indicates a domain of 23 amino acids that are identical in mouse, human,20 and rat Cdc25A.21 The position of codon 128 is highlighted within this domain. Below, a portion of the sequence of CDC25B2 is aligned with Cdc25A to demonstrate that the region containing the codon 128 is deleted in CDC25B2.41