Scope and Contents Warning: graphic surgical content on live rabbits.A silent black and white and color film that details the reaction of the gall bladder of a rabbit to an injection of cholecystokinin (a peptide hormone), three subjects shown before and after injection. Two subjects shown to react favorably, gall bladder evacuates and contracts; a third subject did not react favorably, no contraction seen. Reasons for different reactions not given.Film by D. N. Danforth, H. Doubilet,...