A, ERα protein levels in MCF-7:WS8. B, ERα protein levels in T47D:A18. C, ERα protein levels in BT-474. D, ERα protein levels in ZR-75-1. E, ERα protein levels in MCF-7:5C. F, ERα protein levels in MCF-7:2A. G, ERα protein levels in MCF-7:RAL. H, ERα protein levels in LCC1. I, ERα protein levels in LCC2. J, ERα protein levels in LCC9. Densitometry data are presented in Supplementary Table. S3.