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: Differential gene expression in ERα-positive and ERα-negative breast cancer cells upon leptin stimulation.

Answer: leptin


Question: Therapeutic targets in melanoma: map kinase pathway.

Answer: map kinase


Question: The aromatic-L-amino acid decarboxylase inhibitor carbidopa is selectively cytotoxic to human pulmonary carcinoid and small cell lung carcinoma cells.

Answer:
aromatic-L-amino acid decarboxylase