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.

We suggest that this effect of Myc is mediated by its action upstream of cyclin E - CDK2 , and occurs via the neutralization of p27 ( Kip1 ) family proteins , rather than induction of Cdc25A .
cyclin E