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Herpesvirus egress protein UL20 UL20 is predicted to be a transmembrane protein with multiple membrane spans. It is involved in the trans-cellular transport of enveloped virions, and is therefore important for viral egress. However, UL20 operates in different cellular compartments and different stages of egress in pseudorabies virus and herpes simplex virus. This is thought to be due to differences in egress pathways between these two viruses.
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