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Image courtesy of Natsu Katayama. Embryonic Rosettes Embryologists have long studied the development of a fertilized egg into a blastocyst into a fetus, but one crucial step has always eluded them: the implantation of the blastocyst into the mother’s womb. The blastocyst is the initial ball of cells that develops after fertilization, and in the span of two short days it develops from a ball into a much more complex structure, which, thanks to technological developments, has now been characterized as a delicate ‘rosette’. Image courtesy of Elsevier Inc. and Ivan Bedzhov, Magdalena Zernicka-Goetz. SciArt in America December 2014 7