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
The colour vision is governed by all of the following colour sensitive pigments EXCEPT:-
assistant
The correct answer is  The colour vision is governed by colour sensitive pigments-porphyropsin (red), iodopsin (green) and  cyanopsin (blue).
Reference: Satyanarayana- Biochemistry, 3rd edition, pg-122