Nonstructural protein 4A (NS4A) is a viral protein found in the hepatitis C virus. It acts as a cofactor for the enzyme NS3.[1]
- ^ Beld M, Penning M, van Putten M, et al. (October 1998). "Hepatitis C virus serotype-specific core and NS4 antibodies in injecting drug users participating in the Amsterdam cohort studies". J. Clin. Microbiol. 36 (10): 3002–6. doi:10.1128/JCM.36.10.3002-3006.1998. PMC 105101. PMID 9738057.