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A hypothetical mouse mutation is identified that results in the absence of any circulating leptin in mice harboring the mutation: which of the following statements describe a cellular mechanism that could explain this lack of circulating leptin? Assume that the mutation is a loss of function mutation.I. The mutation occurs in the leptin gene.II. The mutation occurs in the gene that codes for a chaperone protein involved in post-translational modification of leptin.III. The mutation occurs in the gene that codes for a transcription factor that acts as a co-repressor of the leptin gene.Choice A)AIII only(Choice B, I and II only(Choice C, I and III only(Choice D)DI, II, and III

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