Table 1. Shikonin increases free calcium in L6-myotubes.

	Resting (nM)	Peak (nM)	Delta (nM)	P-value
Insulin	92±9	105±10	13±2	<0.001
Shikonin	78±7	98±9	20±6	<0.005

Intracellular levels of calcium in L6 cells before and after acute exposure to 1 µM insulin or shikonin. Data are means ± SEM (n = 15).