[1] KYOTO UNIV,FOOD SCI RES INST,UJI,KYOTO 611,JAPAN
[2] MONELL CHEM SENSES CTR,PHILADELPHIA,PA 19104
[3] UNIV PENN,SCH DENT MED,DEPT BIOCHEM,PHILADELPHIA,PA 19104
[4] VET AFFAIRS MED CTR,PHILADELPHIA,PA 19104
[5] UNIV PENN,DEPT PHYSIOL,PHILADELPHIA,PA 19104