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- W50106039 abstract "Histological and histochemical methods were used to study the ovaries of Greenland seal (Pagophoca groenlandica) from birth-time up to 30 years of age and mature females of Phoca vitulina and Erignathus barbatus. The ovary of the new-born Greenland seal has fetal medullary substance which is a provisory endocrinous gland producing not only sex hormones but also corticosteron. In other species of seals the intestinal cells of the medullary substance are the equivalent of this gland. Within 3-4 weeks after birth the reduction of the fetal medullary substance is completed, it is substituted by the connective tissue and the ovary acquires its typical structure. The rest of the fetal medullary substance is in the depth of the cortex and near the infundibulum of the ovary as lipofuscincontaining cells. When the maturation period approaches, the process of the follicle atresia regularly changes: the epithelium dies quicker, and the multiplication of intestinal cells increases. The ovaries of seals are rich in interstitial cells. Their amount cyclically changes. The cells producing steroid hormones always well hydrolize AS naphthyl-phosphates, the reaction with glycerophosphate is more variable. The connective tissue is poor in acid mucopolysaccharides, its amorphous substance in the ovary cortex is rich in protein. Senile changes of the ovary are noticed in the seal beginning from 20 years of age." @default.
- W50106039 created "2016-06-24" @default.
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- W50106039 date "1976-02-01" @default.
- W50106039 modified "2023-09-23" @default.
- W50106039 title "[Histology and histochemistry of the seal ovaries and the age-related changes in the ovaries of the Greenland seal]." @default.
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