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.

Clinical manifestations of genetic defects affecting gonadotrophins and their receptors.
gonadotrophins

Crystal structure of serine dehydratase from rat liver.
serine dehydratase

Beta 2- but not beta 1-adrenoceptors are involved in desipramine enhancement of aggressive behavior in long-term isolated mice.

beta 1-adrenoceptors