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Abstract
The possibility has been demonstrated of inducing by hypothermia ribosome crystallization in chick oocytes in the last stages of yolk accumulation and in chick embryos from fertilization up to laying. Large quantities of crystallized ribosomes are present in mature oocytes while only very rare ribosome crystals can be observed during the first cleavage. In the subsequent stages of segmentation, there is a gradual appearance of ever-growing quantities of ribosome crystalline aggregates in the blastomere cytoplasm. The presence of ribosome crystals in the fibroblasts of the follicular theca has been also noticed, while it has been impossible to detect them in other hypothermie chick organs. These data are discussed and compared with previously reported data on the ribosome crystallization in chick embryos in order to clarify the possible metabolic significance of this phenomenon.
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