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.

 To assess the safety of the angiotensin converting enzyme inhibitor enalapril a multicenter , open , randomized , prazosin - controlled trial was designed comparing the incidence and severity of symptomatic hypotension on the first day of treatment .
angiotensin converting enzyme

 In contrast to the p16 - mediated G1 block , G1 arrest mediated by the cdk inhibitors p21Cip1 or p27Kip1 cannot be bypassed either by inactivation of pRb or overexpression of E2F family members .
E2F family members

 A wound model for decubitus and leg ulcers consisting of human dermal fibroblasts in type I collagen dermal " equivalent " matrix ( DEM ) was exposed in vitro to electric fields similar to postulated endogenous fields in wounds .

type I collagen