PTPLA, Protein tyrosine phosphatase-like protein, contains protein tyrosine phosphatase-like proteins. Classical PTP is characterized by its signure motif CXXXXXR, however, the Arg to Pro(R/P) variation is found at active site in PTPLA. And PTPLA has been thought to play an important role in development, differentiation, and maintenance of a number of tissue types (1).

Reference
1. Uwanogho, D.A., Hardcastle, Z., Balogh, P., Mirza, G., Thornburg, K.L., Ragoussis, J. and Sharpe, P.T. (1999) Molecular cloning, chromosomal mapping, and developmental expression of a novel protein tyrosine phosphatase-like gene. Genomics, 62, 406-416. PMID: 10644438