system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 19-year-old man presents to his primary care physician for evaluation before going off to college. Specifically, he wants to know how to stay healthy while living outside his home. Since childhood he has suffered severe sunburns even when he goes outside for a small period of time. He has also developed many freckles and rough-surfaced growths starting at the same age. Finally, his eyes are very sensitive and become irritated, bloodshot, and painful after being outside. A defect in a protein with which of the following functions is most likely responsible for this patient's symptoms?
assistant
Recognition of chemically dimerized bases