 Other proteins also exist in the human with domains that are members of the START-based superfamily such as PITP, but are not part of the START domain itself.Mutations in STAR D9 (KIF16A) have been associated with a syndrome which includes severe ID, characteristic features, epilepsy, acquired microcephaly and blindness.The STAR D9 gene encodes a 4.7 kiloDalton amino acid protein which is a member of the kinesin superfamily.