MICHEL DELARUE, ISM / SCIENCE PHOTO LIBRARY MICHEL DELARUE, ISM / SCIENCE PHOTO LIBRARY
Xenopus laevis embryo, 16-cell stage. Xenopus laevis, the African clawed frog, is widely used as a model organism in research in developmental biology. It is popular in this field as its egg cells are large and easily manipulated in the laboratory. The 16 cells (blastomeres) here have resulted from four phases of cell division (mitosis): the fertilised egg (zygote) divided first into two identical cells, then each divided again and so on.
Model release not required. Property release not required.