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: Consider Input:  The gene encoding the cytolytic protein perforin is selectively expressed by activated killer lymphocytes .

Output: cytolytic protein


Input: Consider Input:  Notably , CD28 ligation activated p38 MAPK and CaMKIV , the kinases stimulated by CD3 engagement , suggesting that CD28 acts by increasing the activation extent of p38 MAPK and CaMKIV .

Output: p38 MAPK


Input: Consider Input:  Matrix metalloproteinase s ( MMPs ) are a group of enzymes thought to be responsible for both normal connective tissue matrix remodelling and accelerated breakdown associated with tumour development .


Output: Matrix metalloproteinase