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: Multiple affinity states of opiate receptor in neuroblastoma x glioma NG108-15 hybrid cells. Opiate agonist association rate is a function of receptor occupancy.

Output: opiate receptor


Input: Consider Input: 4-Hydroxypyridazin-3(2H)-one Derivatives as Novel d-Amino Acid Oxidase Inhibitors.

Output: d-Amino Acid Oxidase


Input: Consider Input: Demonstration of histamine receptors on human platelets by flow cytometry.


Output: histamine receptors