Dr. Riddle's pigeons laid golden
eggs, all yolk with neither shell nor white, because he removed their
thymus glands. Dr. Rowntree's husky baby rats played precociously
because he stimulated their thymus glands with sweetbread extract. Then
Dr. Riddle turned another neat trick by giving sweetbread extract to
his thymectomized pigeons, which promptly began to lay normal,
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