Table 1.

Ligand-binding displacement quantification of IGF-1R surface expression in ES cell lines. The column adjacent to cell line names refers to replicate experiments.

Cell Line		K d (M)	Receptor number per cell
A4573	1	2.80 × 10−10	16895
	2	1.81 × 10−10	13163
ES-5838	1	2.69 × 10−10	27274
	2	2.23 × 10−10	14095
SK-N-MC	1	3.24 × 10−10	27519
	2	4.58 × 10−10	40424
TC71		2.37 × 10−10	25156