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:  Free protein S deficiency in acute ischemic stroke .

Output: protein S


Input: Consider Input:  gp170 is expressed at a level 30 to 50 % of the Env precursor gp130 .

Output: Env precursor


Input: Consider Input:  Mutations abolishing MalK function not only result in inability to transport maltose but also cause constitutive expression of the maltose regulon .


Output: maltose regulon