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Polarized Budding of Measles Virus Is Not Determined by Viral Surface Glycoproteins

ABSTRACT For viruses that mature by a budding process, the envelope glycoproteins are considered the major determinants for the site of virus release from polarized epithelial cells. Viruses are usually released from that membrane domain where the viral surface glycoproteins are transported to. We here report that measles virus has developed a different maturation strategy. Measles virus was found to be released from the apical membrane domain of polarized epithelial cells, though the surface glycoproteins H and F were transported in a nonpolarized fashion and to the basolateral membrane domain, respectively.