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424, 509], 'chain,': [91], 'also': [93], 'all': [94, 526], 'synthetic': [95, 116, 398, 411], 'anabolics,': [96], 'there': [97], 'no': [99, 287], 'parallelism': [100, 376], 'between': [101, 377], 'spermatogenic': [104, 380], 'activity,': [105, 381, 383], 'androgenic': [107, 382], 'activity': [108, 386], 'antigonadotropic': [111, 157, 385, 444], 'activity.': [112], '3.': [113], 'Estrogens': [114], 'gestagens': [117, 412, 515], 'do': [118, 413], 'at': [123, 176, 180, 293, 417, 460], 'testicular': [125, 323, 419], 'level.': [126, 420], 'effects': [128, 355, 434], 'estrogens': [130, 409, 436], 'be': [132, 243, 291, 403], 'abolished': [133], 'experimentally': [134], 'by': [135, 219, 246, 268, 333, 478, 489], 'adequate': [136], 'substitution': [137], 'with': [138, 155, 442, 513], 'gonadotropins': [139], 'or': [140, 142, 166, 226, 271, 425, 428, 457, 516], 'androgens,': [141], 'combination': [144, 512], 'gonadotropins.': [148], '4.': [149], 'Only': [150, 439], 'those': [151, 440], 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