GLUL and microcephaly: Nonketotic hyperglycinemia feat: apnea, corpus callosum dysgenesis, epilepsy.Glutamine synthetase deficiencyfeat: epileptic encephalopathy, delayed gyration, necrolytic erythemaAsparagine synthetase deficiencyfeat: epileptic encephalopathy, spastic quadriplegia, microcephaly, hyperekplexia.