instruction:
In this task, you are given a sentence. You are expected to recognize the name of any form of chemical substances. Although there might be several correct answers, you need to write one of them.
question:
Environmental pesticide exposure modulates cytokines, arginase and ornithine decarboxylase expression in human placenta.
answer:
ornithine


question:
Demonstration of histamine receptors on human platelets by flow cytometry.
answer:
histamine


question:
ARF represses androgen receptor transactivation in prostate cancer.
answer:

androgen