Q. A 22-year-old male presents to a new primary care physician for a routine physical examination. He demonstrates hyperextensible skin and reports a history of finger and shoulder dislocations, which he has reduced himself. In particular, he states difficulty driving his sport car as shifting gears can cause his shoulder to “pop out.” He reports a history of easy bruising and multiple fractures of small bones. He has a mild, non-regurgitate mitral valve prolapse. A defect in the synthesis of which molecule likely accounts for his symptoms?