Figure 7: Effects of L-arginine on ACh-induced Ca²⁺ oscillations.

(A) Representative traces of ACh-induced Ca²⁺ oscillations before (A), during (B), and after (C) bath-application of L-arginine (10 mM, L-Arg). Traces (A–C) were recorded from the same cell. (B) Bar graph summarizes the charge (±SEM) and shows an enhanced effect of L-Arg on ACh-induced Ca²⁺ oscillations. Six cells were assessed before and after L-Arg application. *Indicates p < 0.05 compared to baseline level. There was no significance between L-Arg application and washout of L-Arg (p > 0.05), suggesting the effects of L-Arg is non-reversible.