In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
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Question: Cloning, characterization, and expression of a calcitonin receptor from guinea pig brain.

Answer: calcitonin receptor


Question: Activity-dependent cleavage of brain glutamic acid decarboxylase 65 by calpain.

Answer: glutamic acid decarboxylase 65


Question: Metabolic derangement of methionine and folate metabolism in mice deficient in methionine synthase reductase.

Answer:
methionine synthase