FEN1-IN-1 is an inhibitor of flap endonuclease 1 (FEN1). FEN1-IN-1 binds to the active site of FEN1. It partly achieves inhibition by the co-ordination of Mg2+ ions.

Neurotensin (Frog)

Endothelin 1 (swine, human) is a synthetic peptide with the sequence of human and swine Endothelin 1, which is a potent endogenous vasoconstrictor. Endothelin 1 acts through two types of receptors ETA and ETB.