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.

Although the enhanced NK cell activity and LDCC were closely associated with high levels ( greater than 31 fmol / mg ) of estrogen receptor ( ER ) content in the primary tumor , no other clinical or histologic correlation between the increase in either parameter of cytotoxic effector cell function could be found .
estrogen receptor

Consistent with this biologic function , the Epstein - Barr virus ( EBV ) Rta protein powerfully stimulates the promoter of its own gene , Rp , in EBV - positive B cells in transient - transfection reporter - based assays .
Rta protein

The lack of NF - kappa B transactivation and PKC epsilon expression in CD4 ( + ) CD8 ( + ) thymocytes correlates with negative selection .
PKC epsilon