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EMANUELSSON, H. Effects of RNA on ear& chick embryos cultivated in vitro.Acta physiol. scand. 1960. 48. 352-363. -The object of the present investigation has been to find out whether pure RNA can exert a stimulating action on the morphogenesis of early chick embryos. The experiments have been performed on 16 to 18-hour-old embryos cultivated in vitro. RNA from 1) area opaca of 2-day-old chick embryos 2) from heads of 6-day-old chick embryos and 3) from yolk-sacs of 6-day-old chick embryos was tested. -After 24 hours' cultivation in vitro a marked growth and differentiation occurred in embryo-regions homologous to those from which the RNA had been isolated. Other regions, however, were rather retarded in their development and displayed disturbed mitoses. Mitotic counts demonstrated an increased mitotic activity in the growth-stimulated embryo-regions. In the latter a slight increase in the percentage of anaphases + telophases also was noted.-Thus it appears that the pure RNA in itself has the capacity of stimulating growth and differentiation in chick embryos, the localization of the effect being dependent, however, on the origin of the RNA used.As the result of their grafting experiments on early embryos several investigators have arrived at the conclusion that among other effects RNA exerts an inducing activity on embryonic morphogenesis. Most investigators ( BRACHET 1957 p. 402 et seq.) are of the opinion that it is in combination with protein that RNA can act as an inductor, but there are also indications (NIU 1956) that RNA itself can fulfil this mission.RNA from chick embryos has been tested as inductor in newt and axolotl embryos (TIEDEMANN and TIEDEMANN 1956), but very weak inductive effect was reported.
EMANUELSSON, H. Effects of RNA on ear& chick embryos cultivated in vitro.Acta physiol. scand. 1960. 48. 352-363. -The object of the present investigation has been to find out whether pure RNA can exert a stimulating action on the morphogenesis of early chick embryos. The experiments have been performed on 16 to 18-hour-old embryos cultivated in vitro. RNA from 1) area opaca of 2-day-old chick embryos 2) from heads of 6-day-old chick embryos and 3) from yolk-sacs of 6-day-old chick embryos was tested. -After 24 hours' cultivation in vitro a marked growth and differentiation occurred in embryo-regions homologous to those from which the RNA had been isolated. Other regions, however, were rather retarded in their development and displayed disturbed mitoses. Mitotic counts demonstrated an increased mitotic activity in the growth-stimulated embryo-regions. In the latter a slight increase in the percentage of anaphases + telophases also was noted.-Thus it appears that the pure RNA in itself has the capacity of stimulating growth and differentiation in chick embryos, the localization of the effect being dependent, however, on the origin of the RNA used.As the result of their grafting experiments on early embryos several investigators have arrived at the conclusion that among other effects RNA exerts an inducing activity on embryonic morphogenesis. Most investigators ( BRACHET 1957 p. 402 et seq.) are of the opinion that it is in combination with protein that RNA can act as an inductor, but there are also indications (NIU 1956) that RNA itself can fulfil this mission.RNA from chick embryos has been tested as inductor in newt and axolotl embryos (TIEDEMANN and TIEDEMANN 1956), but very weak inductive effect was reported.
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