LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY
Oocytes of the African clawed frog, Xenopus laevis. This frog is a popular organism used in research in developmental biology. This is largely due to its large oocytes, which are easy to manipulate in the laboratory. An oocyte is the cell that develops into a mature female egg cell (ovum). Xenopus oocytes are around one millimetre in diameter.
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