Definition: 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: In contrast , 50 % downmodulation of HLA - A2 by Nef required 16 to 24 h and about 50 - to 100 - fold - greater concentrations of 4 - HT .
Output:
HLA - A2