Instructions: 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.
Input: These results suggested that BMP - 2 might activate p21 ( CIP1 / WAF1 ) transcription by inducing a binding of Smad4 and Smad1 to the 29 - b region in HS - 72 cells .
Output:
BMP - 2