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:  As much thrombin was formed during cardiopulmonary bypass ( measured by the prothrombin activation fragment F1 + 2 and thrombin - antithrombin complexes ) as in normal patients , showing that factor XII was not necessary for thrombin generation .

Output: factor XII


Input: Consider Input:  When expressed in Escherichia coli , SH - PTP2 displays tyrosine - specific phosphatase activity .

Output: SH - PTP2


Input: Consider Input:  In addition , Fc epsilon R1 cross - linking activates PI 3 - kinase .


Output: Fc epsilon R1