Table 1. Drug concentrations.

Drug	Concentration
	1	2	3	4	5	6	7
Methotrexate (μm)	0.0028	0.0084	0.0254	0.0762	0.229	0.686	2.05
6-mercaptopurine (μm)	0.229	0.686	2.05	6.17	18.5	55.5	167
Paclitaxel (μm)	0.0254	0.0762	0.229	0.686	2.05	6.17	18.5
Colchicine (μm)	0.0254	0.0762	0.229	0.686	2.05	6.17	18.5
Dimethyl sulfoxide (%)	0.156	0.313	0.625	1.25	2.5	5	10