Mutations in PYCR2, Encoding Pyrroline-5-Carboxylate Reductase 2, Cause Microcephaly and Hypomyelination. Nakayama T, Al-Maawali A, El-Quessny M, et al. Mutations in PYCR2, Encoding Pyrroline-5-Carboxylate Reductase 2, Cause Microcephaly and Hypomyelination. Am J Hum Genet. 2015;96(5):709-19. doi:10.1016/j.ajhg.2015.03.003 Read more