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Fig. 4. Change in plasma levels of sex steroids according to treatment in experiment B immediately before surgery and 2 weeks and 6 weeks after surgery. Treatment groups are: intact (INT), sham-operated (SHAM), castrated (CAST), castrated plus control implants (CAST + C), castrated plus testosterone implants (CAST + T), castrated plus 11-ketotestesterone implants (CAST + 11KT), castrated plus 17ß-estradiol implants (CAST + E2). Different letters in the same graph indicate statistically significant differences among groups and sampling time (P<0.05). Vertical bars represent S.E.M.