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. glycine(in) = glycine(out) Belongs to the mitochondrial carrier (TC 2.A.29) family. SLC25A38 subfamily.