Competence-Stimulating Peptide-2 (CSP-2) is a quorum sensing signal peptide synthesized by Streptococcus pneumoniae. ComD2, a compatible receptor of CSP-2, exhibits an EC 50 value of 50.7 nM.
Phospho-Glycogen Synthase Peptide-2, a substrate for glycogen synthase kinase-3 (GSK-3), serves as a peptide substrate effective in the affinity purification of protein-serine kinases.