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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.
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Which of the following is the most abundant protein in animal world?
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The correct answer is  Collagen is the most common protein in the animal world, providing the extracellular framework for all multicellular organisms. Ref: Robbins 8th edition Chapter 3.