Sonmez, Fatma Mujgan Microdeletion of chromosome 1q21.3 in fraternal twins is associated with mental retardation, microcephaly, and epilepsy. [electronic resource] - Intractable & rare diseases research Feb 2017 - 61-64 p. digital Publication Type: Case Reports; Journal Article ISSN: 2186-3644 Standard No.: 10.5582/irdr.2016.01075 doi