Microcephaly 21, Primary, Autosomal Recessive, also known as mcph21, is related to microcephaly and congenital nervous system abnormality. An important gene associated with Microcephaly 21, Primary, Autosomal Recessive is NCAPD2 (Non-SMC Condensin I Complex Subunit D2). Affiliated tissues include cortex and brain, and related phenotypes are short stature and absent speech