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.

Vitamin A and retinoid signaling: genomic and non-genomic effects.
retinoid

PPARgamma controls CD1d expression by turning on retinoic acid synthesis in developing human dendritic cells.
retinoic acid

The Fer tyrosine kinase is important for platelet-derived growth factor-BB-induced Stat3 phosphorylation, colony formation in soft agar and tumor growth in vivo.

tyrosine

