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.
Q: Characterization of 5-hydroxytryptamine1B receptors in rat spinal cord via [125I]iodocyanopindolol binding and inhibition of [3H]-5-hydroxytryptamine release.
A:
5-hydroxytryptamine1B