Scatchard analysis of 125I-FGF2 binding to low affinity receptors in control, sporadic (SAD) and familial (FAD) fibroblasts, and FGF2 effect. Specifically bound (B) anf free (F) ligands were measured as described in Materials and Methods. Values were the mean ±SD of three independent experiments each performed in triplicate for n=10 subjects for group. Difference vs. number of receptors in each respective control: *F-test significant at 99%. Differences vs. number of receptors in respective untreated group: §F-test significant at 99%; §§F-test significant at 95%.