Table 1.

Variability of K_t values for hOCT2 with transfection system (data from [35] and our laboratories).

Compound	Kt (µM)	Transfection system	Reference
Dopamine	1400	cc	[53]
	390	oo	[54]
Histamine	940	cc	[53]
	1300	oo	[54]
MPP	19	oo	[55]
	7.8	cc	[56]
	12	cc	Unpublished
	3.1	cc	[57]
	12.3		Unpublished
	19.5	cc	[58]
Norepinephrine	1500	cc	[53]
	1900	oo	[54]
Serotonin	290	cc	[53]
	80	oo	[54]
TEA	27	cc	[59]
	76	oo	[55]
	109	cc	[60]
	20	cc	[61]
	46	cc	[17]

cc = cultured cell (HEK293 or CHO), oo = oocyte, MPP = 1-methyl-4-phenylpyridinium, TEA = tetraethylammonium.