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]: Synthesis, radiosynthesis, and biological evaluation of carbon-11 labeled 2beta-carbomethoxy-3beta-(3'-((Z)-2-haloethenyl)phenyl)nortropanes: candidate radioligands for in vivo imaging of the serotonin transporter with positron emission tomography.
[A]: serotonin transporter

[Q]: Cloning, characterization, and expression of a calcitonin receptor from guinea pig brain.
[A]: calcitonin receptor

[Q]: Desipramine treatment decreases 3H-nisoxetine binding and norepinephrine transporter mRNA in SK-N-SHSY5Y cells.
[A]:
norepinephrine transporter