HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Fish embryo development. Light micrograph of a section through a fish embryo during the early stages development. The cells here are known as blastomeres. Blastomeres are produced through cleavage, a type of cell division, of the ovum after fertilisation. Many blastomeres make up a hollow sphere of cells known as the blastula (seen here). Here, the cell at centre is in the interphase stage between mitotic divisions. Magnification: x1670 when printed 10 centimetres wide.
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