This entry includes phosphatidylglycerophosphatase and protein-tyrosine phosphatase 1 (PTPMT1) and its homologues from animals and plants.Phosphatidylglycerophosphatase and protein-tyrosine phosphatase 1 (PTPMT1) regulates phospholipid biosynthesis []. In mammals, it is a mitochondrial phosphatidylglycerophosphate (PGP) phosphatase that regulates cardiolipin biosynthesis [].In Arabidopsis there are two homologues, PTPMT1 and PTPMT2. They are involved in root growth and columella cells organization [].