Abstract
To study the effect of radiation on Drosophila melanogaster larvae, various imaginal discs and organs of third-instar larvae were cultured in a synthetic medium (K-6) with cephalic complexes as a source of the metamorphic hormone. Irradiated discs or organs were used for culture in one series, and irradiated cephalic complexes were used in the other. It was concluded that the decrease in % ecdysis was caused by a fractional disturbence of the cephalic complex induced by radiation. The brain, the wing disc, and the testis were more radiosensitive than the eye disc, the leg disc, the salivary gland, and the fat body.

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