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Rat ventral prostate nuclei contain androgen-binding sites which are susceptible or resistant to excision by endonucleolytic action. Those which were susceptible were associated both with oligonucleosomal and subnucleosomal particles. The sedimentation profile characteristic of a nuclear androgen-receptor complex could be obtained by exhaustive nucleolytic digestion or by treatment of fractions with KCl (0·6 mol/l). Androgen-binding sites resistant to DNAase I were also resistant to KCl, whereas those sites resistant to micrococcal nuclease were partially extractable with KCl. Nuclease-resistant sites could be extracted with heparin (10 mg/ml). Androgen–receptor complexes obtained from nuclease-sensitive or nuclease-resistant regions by extraction with KCl or heparin were indistinguishable by routine sedimentation analysis.