Microtubule-associated protein tau (26-44) is a synthetic peptide chain with an amine group attached to glutamine and an carboxyl group attached to lysine.

4-Thiouridine (4-SU) is a photoactivatable ribonucleoside analog that is widely used for RNA analysis, including short-range RNA-RNA crosslinking and nascent RNA labeling. The crosslinking thio moiety is attached directly to the nucleotide base, thus 4-SU

Auxinole is a potent auxin antagonist of TIR1/AFB receptors, binding TIR1 to block the formation of the TIR1-IAA-Aux/IAA complex . It inhibits auxin-responsive gene expression.