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 Pi signals are conveyed to PHO8 by binding of PHO4 protein , a positive regulatory factor , to a promoter region of PHO8 ( PHO8p ) under the influence of the PHO regulatory circuit .
A:
PHO4 protein