Q: 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.
The most frequent abnormality was GH deficiency ( six cases ) , followed by gonadotropin ( four cases ) , cortisol ( four cases ) , and TSH ( one case ) , whereas four patients showed high serum PRL values .
A:
serum PRL