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VARIATIONS IN THE FIBULA AND TIBIA AFTER PARTIAL IRRADIATION OF THE LEG BUD OF A CHICK EMBRYO
M Kieny, M Schue
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Abstract
Expentments were made to test the hypothesis that the tibia and femur compete for material left intact after irradiation of the leg bud of chick embryos. Localized irradiation of forming tibia or fibula inhibits or prevents, selectively, the development of the irradiated bud without affecting differentiation of the protected bud. The two buds react differently to irradiation. The fibula is always missing when its bud is irradiated. The tibia, however, is rarely missing but is always reduced even if the fibula exceeds it in length. There is competition between the two when they are equally irradiated, but this competition is not manifest when one is irradiated and the other is not. (T.R.H.)