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.

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

Output: leptin


Input: Consider Input: Overview of monoclonal antibodies and small molecules targeting the epidermal growth factor receptor pathway in colorectal cancer.

Output: epidermal growth factor receptor


Input: Consider Input: Cannabinoid discrimination and antagonism by CB(1) neutral and inverse agonist antagonists.


Output: CB(1)