G4 peptide (SIIGFEKL) is a variant of the agonist ovalbumin (OVA) peptide (257-264), SIINFEKL. OVA Peptide is a class I (Kb)-restricted peptide epitope of ovalbumin presented by the class I MHC (major histocompatibility complex) molecule, H-2Kb (class I genes of the mouse MHC).

Insulin (insulin from the bovine pancreas) is a two-chain polypeptide hormone produced in human pancreatic cells.Insulin cattle are often used as a growth supplement for cultured cells.

Kemptamide, a 13 amino acid fragment with a sequence corresponding to residues 11-23 of gizzard light chain. Kemptamide is a peptide substrate of myosin light-chain kinase (MLCK).