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 Q]:  Under the same conditions , Lck did not stimulate IL - 2 promoter unless it was activated by mutation .
[EX A]: IL - 2

[EX Q]:  SKAT - 2 is tissue restricted in expression at the RNA level , detectable only in brain and at low levels in kidney and spleen and few hematopoietic cell lines .
[EX A]: SKAT - 2

[EX Q]:  Although both isomers were expressed in human erythroid - megakaryocytic cell lines , megakaryocytic maturation with loss of erythroid phenotype induced by phorbol 12 - myristate 13 - acetate ( PMA ) resulted in exclusive downregulation of fNF - E2 , suggesting that fNF - E2 promoter is more erythroid specific .
[EX A]:
fNF - E2