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.
Reduction of p53 protein was detected after 1 day of OM treatment and reached maximal suppression of 10 - 20 % of control after 3 days in H3922 and 40 % of control after 4 days in MCF - 7 cells .
A:
p53 protein