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 indifferent embryo begins phenotypic sexual differentiation during
assistant
The correct answer is  The embryo during weeks 1-6 remains in an undifferentiated stage. The embryo begins phenotypic sexual differentiation during week 7.