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. Plays a role as pro-apoptotic protein that induces caspase-dependent apoptosis. glycine(in) = glycine(out) Preferentially expressed in erythroid cells. Up-regulated in the brains of patients with Alzheimer's disease. The disease is caused by variants affecting the gene represented in this entry. Belongs to the mitochondrial carrier (TC 2.A.29) family. SLC25A38 subfamily.