_:vb50939397 . _:vb50939397 . _:vb50939397 . _:vb50939397 "url:https://www.ncbi.nlm.nih.gov/pubmed/25865492"^^ . _:vb50939397 . _:vb50939397 "url:https://www.ncbi.nlm.nih.gov/pubmed/27130255"^^ . _:vb50939397 "A hypomyelinating leukodystrophy characterized by autosomal recessive inheritance of progressive postnatal microcephaly, severely delayed psychomotor development and hypomyelination that has_material_basis_in homozygous mutation in the PYCR2 gene on chromosome 1q42."^^ . _:vb50939397 .