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.

 Catalytically active Syk promotes and stabilizes the formation of tightly capped BCR complexes at the plasma membrane .
BCR complexes

 Using enhancer - reporter constructs , IL - 4 specifically down - regulated the NFIL - 2B element .
IL - 4

 Excess labeled steroid as well as most non - specifically bound steroid is easily washed away , leaving the hormone - receptor complex retained by the beads .

receptor complex