Pancreatic Polypeptide, rat is an agonist of NPY receptor, with high affinity at NPYR4. Pancreatic polypeptide (PP) is a 36-amino acid, C-terminally amidated peptide, and is a member of the PP-fold peptide family. It is produced and secreted by the PP cells of the islets of Langerhans.

(+)-Blebbistatin is the inactive enantiomer of (–)-Blebbistatin. (–)-Blebbistatin is a selective myosin II ATPase inhibitor.

Acetyl-Hirudin (54-65) (sulfated) is a acetyl-fragment of Hirudin which binds directly to thrombin-rHCII(L444R) and disrupts interactions between the N-terminal acidic domain of rHCII and anion-binding exosite I of thrombin that serves to stabilize the complex.