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:  A V1 mutant generated in vivo with 11 of the 14 N - terminal amino acids altered , was viable and produced symptoms typical of a wild - type infection .

Output: V1 mutant


Input: Consider Input:  In contrast , postmitotic neurons possessed extremely low levels of E2F1 protein as assessed by the electrophoretic mobility shift assay and Western blotting .

Output: E2F1 protein


Input: Consider Input:  Analysis of pseudo VH gene segment recombination products reveals no bias in D gene segment reading frame utilization .


Output: D gene segment