Contrary to theory, taste cells of T1r3 KO mice respond to l-amino acids and IMP.
Selective mGluR1 and mGluR4 agonists activate taste cells of mice.
mGluR1 and mGluR4 antagonists block l-amino acids and IMP responses of T1r3 KO mice.
Brain and taste variants of mGluR1 and mGluR4 detect l-amino acids and IMP tastes.