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Single-cell data reveal a cellular 'developmental hourglass' in vertebrate embryos

Summary by Phys.org
Scientists have long observed that embryos of different species within a phylum look quite distinct at early and late developmental stages but resemble one another more during mid-embryogenesis, a phenomenon known as developmental hourglass.

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Phys.org broke the news in United Kingdom on Monday, March 16, 2026.
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