Bardet-Biedl Syndrome 21, also known as bbs21, is related to cone-rod dystrophy 16 and cone-rod dystrophy 2. An important gene associated with Bardet-Biedl Syndrome 21 is CFAP418 (Cilia And Flagella Associated Protein 418). Affiliated tissues include heart and kidney, and related phenotypes are abnormality of the dentition and delayed speech and language development