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.

 Expression of oestrogen and progesterone receptors by mast cells alone , but not lymphocytes , macrophages or other immune cells in human upper airways .
progesterone receptors

 Studies to date have identified elements 5 ' to the IL - 3 coding sequences that regulate its transcription , but the sequences that confer T cell - specific expression remain to be clearly defined .
IL - 3

 In conclusion , ( 1 ) somatic BCL - 6 mutations are restricted to cHD cases of B - cell origin , and ( 2 ) the BCL - 6 mutations represent mostly irrelevant somatic base substitutions without consequences for BCL - 6 protein expression and the pathogenesis of cHD .

BCL - 6

