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Anuran metamorphosis experiments with regard to age- and hormonal conditions

, : Anuran metamorphosis experiments with regard to age- and hormonal conditions. Atti R Accad Naz Lincei Rend Cl Sci Fis Mat E Nat 18(5/6): 237-241

Preliminary report. Do the lytic, metamorphogenic substances operate only in the region of metamorphosis? Do they operate regardless of the substratum, or is this latter in a peculiarly favoring condition? Transplants were made from the tails of very young donors to hosts approaching metamorphosis. Does metamorphosis induced by thyroid-extract involve both normal structures and transplants regardless of their respective age-condition and location of graft? Both embryos and larvae were used. Results: Transplants, embryonic or larval, to hosts of the same age metamorphose normally and coincidentally, even if abnormally placed. All tissues were involved. If the donor be slightly younger, metamorphosis still is synchronous. With increasing age-discrepancy (larvae), tendency to synchronism diminishes but does not completely disappear. The lytic substances must be ubiquitous, and there must be peculiarly favoring conditions in the substratum. Thyroid-extract hastens metamorphosis in host and graft, regardless of respective age-condition, tending to eliminate age-discrepancy.


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