(a) Sample recordings of two single CT fibers (one small
and one large) in response to 0.1 M NaCl, 0.01 M HCl, 0.02 M QHCl, 0.5
M Suc, and 0.02 M Sac before and after leptin (100 ng/g of b.w.) in
lean C57BL mice. In the large unit (Suc-best fiber), responses to
sucrose and saccharin decreased after leptin, whereas the small unit
(NaCl-best fiber) showed no such leptin inhibition. (b)
Response profiles to 0.5 M Suc, 0.02 M Sac, 0.1 M NaCl, 0.01 M HCl, and
0.02 M QHCl before (control) and after leptin in two groups of fibers,
classified whether they would respond best to sucrose among four basic
taste stimuli (Suc-best fibers, n = 9) or not
(other fibers, n = 21). *, t
test, P < 0.05.