PTPN11(protein tyrosine phosphatase, non-receptor type 11) is also named as PTP-1D, PTP2, PTP2C, PTP3, SHP2, CFC, CFC, BPTP3, SH-PTP2, SH-PTP3, MGC14433 and belongs to the protein-tyrosine phosphatase family and non-receptor class 2 subfamily. It modulates and regulates signaling through numerous pathways, many of which are active in the developing endocardial cushions and implicated the ERK pathway as a central mechanism(PMID:19017799). Its signaling may play equally important roles in retinal survival in both physiological and pathological conditions(PMID:21576358). Defects in PTPN11 are the cause of LEOPARD syndrome type 1(LEOPARD1), Noonan syndrome type 1(NS1), juvenile myelomonocytic leukemia(JMML) and metachondromatosis(MC). It has 3 isoforms produced by alternative splicing.