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  2. Betacoronavirus - Wikipedia

    en.wikipedia.org/wiki/Betacoronavirus

    The name "betacoronavirus" is derived from Ancient Greek βῆτα (bē̂ta, "the second letter of the Greek alphabet"), and κορώνη (korṓnē, “garland, wreath”), meaning crown, which describes the appearance of the surface projections seen under electron microscopy that resemble a solar corona.