Figure S9. BH4 treatment altered neither the Ca²⁺ transients nor L-type Ca²⁺ currents in single cardiac myocytes.

(A) Ca²⁺ transients in electrically stimulated (1 Hz, 10 V) single cardiac myocytes. Ca²⁺ signals were monitored by Fluo4AM, an intracellular Ca²⁺ indicator. (B) L-type Ca²⁺ current traces were recorded in single cardiac myocytes by patch-clamp with indicated voltage pulse protocols. Values are means ± SEMs.