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Researchers discover cell reproduction not triggered by retinoic acid as previously believed

Meiosis is essential to sexual reproduction. For almost 15 years, it has been commonly held that retinoic acid, a molecule derived from vitamin A, triggers meiosis in mammalian germ cells. Yet, in joint articles published in Science Advances, French researchers from the Institut de Biologie Valrose (CNRS / INSERM / Université Côte d’Azur) and the IGBMC (CNRS / INSERM / University of Strasbourg), with their colleagues, have demonstrated that meiosis in mice begins and proceeds normally even in the absence of retinoic acid. These findings set the stage for new research in the field of reproductive biology.

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When baby planets melt: Searching for the histories of planetesimals

Let’s start at the beginning. Before humans, before Earth, before any of the planets existed, there were baby planets—planetesimals. Coalesced from dust exploded outward by the solar nebula, these blobs of material were just a few kilometers in diameter. Soon, they too aggregated due to gravity to form the rocky planets in the innermost part of the solar system, leaving the early details about these planetesimals to the imagination.

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Study reveals rich genetic diversity of Vietnam

Vietnam features extensive ethnolinguistic diversity and occupies a key position in Mainland Southeast Asia (MSEA). Vietnam, with its borders to China, Laos and Cambodia, has a rich geographical diversity, and ample access to human migration with the Red River and Mekong deltas, and a long coastline.

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