HENNING DALHOFF / SCIENCE PHOTO LIBRARY HENNING DALHOFF / SCIENCE PHOTO LIBRARY
Cleavage cell division. Illustration of a cell with the genetic material (DNA, red) replicated within the cell nucleus. This can represent a type of cell division called cleavage that occurs in the early stages of the formation of an embryo. The zygote (formed after fertilisation) undergoes rapid cell division cycles to form a 16-cell stage called the morula.
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