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]: Effect of cyproheptadine on serum leptin levels.
[A]: leptin


[Q]: Synthesis, biological evaluation, and molecular modeling of glycyrrhizin derivatives as potent high-mobility group box-1 inhibitors with anti-heart-failure activity in vivo.
[A]: high-mobility group box-1


[Q]: A selective retinoid X receptor agonist bexarotene (LGD1069, targretin) inhibits angiogenesis and metastasis in solid tumours.
[A]:
retinoid X receptor