Microcephaly 4, Primary, Autosomal Recessive, also known as mcph4, is related to microcephaly 9, primary, autosomal recessive and primary autosomal recessive microcephaly. An important gene associated with Microcephaly 4, Primary, Autosomal Recessive is KNL1 (Kinetochore Scaffold 1). Affiliated tissues include cortex and brain, and related phenotypes are intellectual disability and global developmental delay