The function of PTP4A3 (protein tyrosine phosphatase 4A3, Ensembl gene identifier ENSG00000184489) is as follows. Protein tyrosine phosphatase which stimulates progression from G1 into S phase during mitosis. Enhances cell proliferation, cell motility and invasive activity, and promotes cancer metastasis. May be involved in the progression of cardiac hypertrophy by inhibiting intracellular calcium mobilization in response to angiotensin II. .