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Egress of nucleocapsids from the nucleus. (A) Budding of nucleocapsids at the inner nuclear membrane (arrow) resulted in primary enveloped nucleocapsids in the perinuclear cisterna (asterisk). (B) Direct fusion of the primary envelope with the outer nuclear membrane (arrows) resulted in release of naked nucleocapsids into the cytoplasm. Note also the primary envelopment of a nucleocapsid at the inner nuclear membrane (arrowhead). Bars, 250 nm. N, nucleus.
