Figure 1.

The displacement of radiolabeled propionyl-³H FSH from human FSH receptor was measured as a reduction in dpm bound across the indicated concentrations of follitropin delta (open circles, blue) and follitropin alfa (open squares, red), or total binding in the absence of unlabeled recombinant FSH protein (open triangle, black). Each concentration was tested in duplicate, with the mean and s.d. indicated. Data were fit using four-parameter curve-fitting. The results for one experiment are shown, whereas results from two other tests producing similar results are not shown.