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.

Ex Input:
Transcription factor B - cell - specific activator protein ( BSAP ) is differentially expressed in B cells and in subsets of B - cell lymphomas .

Ex Output:
Transcription factor

Ex Input:
During vertebrate hematopoiesis , FOG and GATA proteins cooperate to promote erythrocyte and megakaryocyte differentiation .

Ex Output:
GATA proteins

Ex Input:
Further studies show that genes governing the expression of class II antigens fall into at least three complementation groups ; two of these were previously unidentified in mutant cell lines generated in vitro .

Ex Output:
class II antigens