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In order to elucidate a putative role of neurally derived noradrenaline in the thymus development, and in maintenance of adult thymus structure, sexually immature male rats (21-day-old at the beginning of treatment) and young adult animals (75-day-old on the beginning of treatment) were treated with the non-selective β-adrenoceptor antagonist propranolol (0.40 mg/100 g BW/day, s. c.) for 15 consecutive...