Description:ContentsA. Bigiani, C. Mucignat-Caretta, G. Montani, and R. TirindelliPheromone Reception in MammalsW. MeyerhofElucidation of Mammalian Bitter TasteH.U. ZeilhoferSynaptic Modulation in Pain PathwaysC.-K. ChenThe Vertebrate Phototransduction Cascade, Amplification and Termination Mechanisms