Immediate early (EI) protein that plays many roles during productive infection including regulation of viral gene expression and nuclear export of intronless viral RNAs. Human herpesvirus 6B (HHV-6 variant B) (strain Z29) mRNA export factor ICP27 homolog (His & Myc) is expressed in E. coli expression system with N-10xHis and C-Myc tag. The predicted molecular weight is 34.6 kDa and the accession number is P52539.