Coated vesicles in the oocyte

TL;DRAbstract

One of the most striking aspects of oogenesis is the remarkable growth that is undertaken by the oocyte. This is normally taken to be an adaptation for providing the embryo with the substances needed to sustain full development. In fact, with the exception of mammals, oocytes of most species achieve this by accumulating large quantities of reserve material generally referred to as yolk. The latter may either be derived from the maternal blood stream, in which case it is called heterosynthetic, or, alternatively, synthesised by the oocyte itself, and is then termed as autosynthetic (Schechtman, 1955).

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