Fig. 1. Proteins encoded by two PP4 genes of C. elegans. (A) Alignment of the amino acid sequences of C. elegans PPH-4.1 and PPH-4.2 with other PP4 families (human PPP4, Drosophila PP4 and Arabidopsis PPX1). Black shadowing indicates identical residues. (B) A phylogenic tree of PPP family protein phosphatses.