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The earliest days after fertilization, once a sperm cell meets an egg, are shrouded in scientific mystery. The process of how a humble single cell becomes an organism fascinates scientists across ...

Shelby is an assistant editor for The Scientist. She earned her PhD from West Virginia University in immunology and microbiology and completed an AAAS Mass Media fellowship. View full profile. Learn ...

A human embryo-like model was successfully developed by a group of scientists at the California Institute of Technology, led by renowned biologist Madalena Zernicka-Goetz. The model replicates the ...