CAS Number: 197794-83-5 Molecular Weight: 647.41 Salt Form: TFA Purity: >96% Sequence (3-letter): Thr-Phe-Leu-Leu-Arg-NH2 Sequence (1-letter): TFLLR-NH2 Storage: -20 ?C or below Protease-activated receptors (PAR) are a type of G protein-coupled receptors activated by cleavage of part of their extracellular domain via serine proteases. This cleaved part of the receptor is then able to act as a ligand. PAR-1 agonist mimics the cleaved ligand.