Nonstructural protein 4B (NS4B) is a viral protein found in the hepatitis C virus. With a mass of 27 kDa, it is likely involved in the formation of intracellular membrane structures that enable virus replication.Ella H Sklan and Jeffrey S Glenn. Chapter 8. HCV NS4B: From Obscurity to Central Stage in "Hepatitis C Viruses: Genomes and Molecular Biology." / Tan SL. — Norfolk: Horizon Bioscience, 2006.
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