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
Which of the following conversion is irreversible
assistant
The correct answer is  One carbon groups are formed from various sources. Except the formation of methyl-THFA The other one-carbons are interconveible The only way of regeneration of active THFA from methyl-THFA is the methionine synthase reaction.