text_1: Sweet taste receptors on the tongue are deactivated by between 1 and 10 mM glucose.
text_2: Molecular genetics and heterologous expression implicate T1r2 plus T1r3 as a sweet-responsive receptor,and T1r1 plus T1r3,as well as a truncated form of the type 4 metabotropic glutamate receptor (taste-mGluR4),as umami-responsive receptors.