Mitochondrial glycine transporter that imports glycine into the mitochondrial matrix. Plays an important role in providing glycine for the first enzymatic step in heme biosynthesis, the condensation of glycine with succinyl-CoA to produce 5-aminolevulinate (ALA) in the mitochondrial matrix. Required during erythropoiesis. {ECO:0000255|HAMAP-Rule:MF_03064, ECO:0000269|PubMed:19412178, ECO:0000269|PubMed:27476175}. Plays a role as pro-apoptotic protein that induces caspase- dependent apoptosis. . This is the function of SLC25A38 (solute carrier family 25 member 38, ENSG00000144659).