GNPAT and rhizomelic chondrodysplasia punctata: The glyceronephosphate O‐acyltransferase knockout mouse (Gnpat KO), one of the models for complete ether lipid deficiency, displays phenotypic abnormalities similar to those of RCDP, including developmental defects of the central and peripheral nervous system, eyes, testis, and other organs.12, 13 Both in RCDP patients and in Gnpat KO mice myelination is impaired in the central and peripheral nervous system4, 14.