has role virmugen virmugen role Classical swine fever virus gene E1 from Classical swine fever virus gene NCBI_Protein_ID: 325461; PMID: 19203774 Rebecca Racz An N to A amino acid substitution was made in the N594 site of the E1 glycoprotein, resulting in attenuation of the virus in swine. This attenuated virus induced protection against challenge with wild type CSFV Oliver He