Study of Thumb Pad Regions Developed by the Administration of Testosterone in a Young Female of <i>Rana nigromaculata</i> with a Supernumerary Forelimb

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  • 過剰前肢をもつ幼若雌トノサマガエルにおけるテストステロン投与による指たこ発生部位の検討

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A young female Rana nigromaculata with a supernumerary forelimb was collected in a paddy field. The administration of testosterone to this frog induced the development of the thumb pads on the normal forelimbs as well as on the supernumerary limb. The skeletal structure of the manual region and histological structure of the thumb pads are described. Studies of this kind seem to be effective in solving the mechanism inducing pad development on a specific part of the fingers.

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