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Yolk granules

Yolk granules

G450/0089

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Credit

DR ELENA KISELEVA / SCIENCE PHOTO LIBRARY DR ELENA KISELEVA / SCIENCE PHOTO LIBRARY

Caption

Yolk granules. Coloured scanning electron micrograph (SEM) of yolk granules (green) in an extract of cytoplasm taken from a frog (Xenopus sp.) oocyte (egg). Yolk granules are storage bodies for a type of lipoprotein called vitellin, which nourishes the embryo during the first stages of development. The pink structures are endoplasmic reticulum (ER) vesicles. The ER is a membrane-bound cell organelle that is the site of lipid synthesis and the production of membrane- bound proteins.

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