instruction:
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.
question:
 EBV utilizes CD21 / CR2 as its receptor on B cells to initiate the infection process .
answer:
CD21 / CR2


question:
 NFAT expression was determined by using immunoprecipitation and Western blot analysis , DNA - binding assays , and RT - PCR analysis of eosinophil mRNA .
answer:
eosinophil mRNA


question:
 Bruton ' s tyrosine kinase ( Btk ) , a member of the Tec family of cytosolic kinases , is essential for B cell development and function .
answer:

tyrosine kinase