SNX3 and microcephaly: A disruption of sorting nexin 3 (SNX3) on 6q21 was previously reported in a patient with MMEP (microcephaly, microphthalmia, ectrodactyly, and prognathism) and t(6;13)(q21;q12) but no SNX3 mutations were identified in another sporadic case of MMEP, suggesting involvement of another gene.