Astressin is an amino-terminal truncated analog of CRF that retains high affinity binding to the extracellular domain of the receptor and is believed to act as a neutral competitive antagonist of receptor activation.

Neochebulinic acid

DL-O-Phosphoserine a normal metabolite in human biofluid is an ester of serine and phosphoric acid. Serine is one of three amino acid residues that are commonly phosphorylated by kinases during cell signaling in eukaryotes.