N-Formyl-Met-Leu-Phe (fMLF) is a synthetic peptide that acts as an agonist at formyl peptide receptors (FPR; Ki = 0.8 pM).

D-proline is an isomer of the naturally occurring amino acid L-Proline. D-amino acids have been found in relatively high abundance in human plasma and saliva. These amino acids may be of bacterial origin but there is also evidence that they are endogenously produced through amino acid racemase activity.

Nickel(II) oxide is the chemical compound with the formula NiO. It is the principal oxide of nickel.