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:  To determine the role of the transmembrane region of HN on fusion - promoting activity , mutant HN proteins were expressed and their biological activities examined .

Output: mutant HN proteins


Input: Consider Input:  These cells also showed an increase in cyclin A and cyclin A - and E - associated kinase activities characteristic of S phase induction .

Output: cyclin A


Input: Consider Input:  Nine months after the end of the vaccination anti - HBsAg levels had dropped to 9 + / - 4 IU / 1 ( M + / - SE ) , with a geometric mean of 5 IU / 1 , in the nine remaining evaluable patients .


Output: anti - HBsAg