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.

[Q]:  Similar tissue - specific patterns are observed with a fusion between the caufliflower mosaic virus 35S RNA promotor and the GUS gene .
[A]: GUS gene


[Q]:  To study the mechanisms and the signaling pathways involved , IGF - 1R promoter reporter constructs were transiently transfected in CHO - AT1 cells that overexpress angiotensin AT1 receptors .
[A]: angiotensin AT1 receptors


[Q]:  Indeed , after a single oral dose , the role of the mu - receptor agonist component of the antinociceptive effect of tramadol appears to be minor , with most of the analgesic effect being attributable to nonopioid properties of the parent compound .
[A]:
mu - receptor