For researchers wishing to screen for the appropriate coelenterazine derivatives to use, we offer this kit with 25 ug each of nine coelenterazine analogs: coelenterazine, coelenterazine cp, coelenterazine f, coelenterazine fcp, coelenterazine h, coelenterazine hcp, coelenterazine i, coelenterazine ip, and coelenterazine n.