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: 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 .

Output: estrogen receptor

Input: Consider Input: Quite unexpectedly , we also found that in unstimulated cells there is a constant ongoing process of degradation and replacement of complexed I kappa B alpha .

Output: I kappa B

Input: Consider Input: We have previously observed that ionizing radiation induces tyrosine phosphorylation in human B - lymphocyte precursors by stimulation of unidentified tyrosine kinases and this phosphorylation is substantially augmented by vanadate .
Output: tyrosine kinases