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.
A stable and stoichiometric complex of CaMKIV with protein serine - threonine phosphatase 2A ( PP2A ) was identified in which PP2A dephosphorylates CaMKIV and functions as a negative regulator of CaMKIV signaling .
A:
negative regulator