Elasmobranch species as models for studi
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Hamlett, William C.
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Article
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1990
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John Wiley and Sons
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English
β 313 KB
Three principal modes of embryonic nutrition occur in the vertebrates, viz., 1) uitellogenesis, the sequestering of yolk, synthesized in the liver, in the oocyte; 2) histotroph, nutrient substances supplies to the embryo in viviparous animals by secretory activity of the uterus; or 3) placenta, the