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. Author manuscript; available in PMC: 2012 Aug 1.
Published in final edited form as: Steroids. 2011 Feb 1;76(9):921–928. doi: 10.1016/j.steroids.2011.01.008

Fig. 4.

Fig. 4

Steroid binding characteristics of membrane progesterone receptor on MDA-MB-468 cells. A, specific [3H]-P4 binding to plasma membranes in a single point radioreceptor assay. TB: total binding; NSB: non-specific binding; SB: specific binding. B, Saturation and Scatchard analyses of [3H]-P4 binding to plasma membranes. C, Competition curves for steroid binding to plasma membranes of MDA-MB-468 cells expressed as a percentage of maximum specific [3H]-P4 binding. P4: progesterone; E2: estradiol; T: testosterone; cort: cortisol; R5020: promegestone.