50.0 MB (2.6 MB compressed)
5115 x 3417 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
WIM VAN EGMOND / SCIENCE PHOTO LIBRARY WIM VAN EGMOND / SCIENCE PHOTO LIBRARY
Common starfish egg. Differential interference contrast (DIC) light micrograph of a common starfish (Asterias rubens) egg at the gastrula stage. Following fertilisation an embryo undergoes multiple rounds of mitotic cell division, each time doubling the number of cells. Eventually a blastula of hundreds of cells is produced, which then start to differentiate. During gastrulation the single-layered blastula is reorganised into a three-layered (trilaminar) structure known as the gastrula. Magnification: x160 when printed 10 centimetres wide.
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