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]: Rac2 , a member of the Rho family of GTPases , is highly expressed in myeloid cells and is a regulator of the NADPH - oxidase complex .
[A]: Rho family

[Q]: In contrast to the restricted tissue expression of gonadotropin and TSH receptors in gonads and thyroid , respectively , LGR4 is expressed in diverse tissues including ovary , testis , adrenal , placenta , thymus , spinal cord , and thyroid , whereas LGR5 is found in muscle , placenta , spinal cord , and brain .
[A]: TSH receptors

[Q]: Interestingly , these " activation - defective " mutants segregated into two classes : 1 ) those that were unable to form dimers but that could still form higher order oligomers and transform cells , and 2 ) those that were defective for PDGF - R binding and were transformation - incompetent .
[A]:
PDGF - R