the data show ( i ) that amiloride is a specific blocker of the chorda tympani response to sodium chloride , but not to potassium chloride , ( ii ) that the sodium and potassium gustatory systems are largely independent at the peripheral level , and ( iii ) that the classical ion taste `` '' receptor '' '' is actually a specific transport pathway permitting the cation to enter the taste-bud cell and thereby to spread depolarizing current .
C0002502
amiloride
C0032821
potassium