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: The B cell factor was purified to homogeneity using affinity chromatography and consists of three peptides of 62 , 61 , and 58 . 5 + / - 1 . 5 kd .

Output: B cell factor

Input: Consider Input: The mechanism of reducing NO production resulting from inhaled NO may involve , in part , the activities of reactive oxygen species and / or nuclear factor - kappaB .

Output: nuclear factor

Input: Consider Input: We review the contribution of several transcription factors to the control of macrophage development
Output: transcription factors