This family includes the mammalian protein tyrosine phosphatase-like protein, PTPLA. A significant variation of PTPLA from other protein tyrosine phosphatases is the presence of proline instead of catalytic arginine at the active site. It is thought that PTPLA proteins have a role in the development, differentiation, and maintenance of a number of tissue types [1].

1: Molecular cloning, chromosomal mapping, and developmental expression of a novel protein tyrosine phosphatase-like gene. Uwanogho DA, Hardcastle Z, Balogh P, Mirza G, Thornburg KL, Ragoussis J, Sharpe PT; Genomics 1999;62:406-416. PMID:10644438

2: Human protein tyrosine phosphatase-like gene: expression profile, genomic structure, and mutation analysis in families with ARVD. Li D, Gonzalez O, Bachinski LL, Roberts R; Gene 2000;256:237-243. PMID:11054553