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.

 The mechanism responsible for the delayed nuclear accumulation of phosphorylated STAT3 was examined in detail , focusing on the role of B cell - derived lymphokines .
phosphorylated STAT3

 A detailed histopathologic review of 50 primary breast cancer tumors analyzed for estrogen receptor ( ER ) level was carried out and a variety of morphologic features correlated with ER results to identify any factors that will improve the management and prognosis for breast cancer .
estrogen receptor

 In addition , Tax703 and Tax , but not TaxM22 , converted cell growth of a mouse T - cell line from being interleukin ( IL ) - 2 - dependent to being IL - 2 - independent .

IL - 2