The function of PTPN7 (protein tyrosine phosphatase non-receptor type 7, ENSG00000143851) is as follows. Protein phosphatase that acts preferentially on tyrosine- phosphorylated MAPK1. Plays a role in the regulation of T and B- lymphocyte development and signal transduction. {ECO:0000269|PubMed:10206983, ECO:0000269|PubMed:10559944, ECO:0000269|PubMed:10702794, ECO:0000269|PubMed:1510684, ECO:0000269|PubMed:1530918, ECO:0000269|PubMed:9624114}.