Zebrafish have two paralogs for Protein Phosphatase 1 β.

<p>A. A protein sequence alignment of zebrafish PP1Ba and PP1Bb with human PP1β. The amino acids marked with a * are critical for isoform specific interaction with Mypt1. B. Phylogenetic analysis of vertebrate PP1β genes using the maximum likelihood method with <i>Drosophila</i> Flapwing (the Drosophila PP1β) as an outgroup.