MICHEL DELARUE, ISM / SCIENCE PHOTO LIBRARY MICHEL DELARUE, ISM / SCIENCE PHOTO LIBRARY
Sea urchin oocyte, light micrograph. An oocyte is a female sex cell, which can divide either into other oocytes by mitosis or into ova (egg cells) by meiosis. The nucleus (purple) and nucleolus (round, within nucleus) are seen within the cell body (orange). The egg cells and embryos of sea urchins have long been used as a model cell in embryology studies.
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