sentence: Alternatively , other viral proteins or unidentified cellular proteins could be substrates for deacetylation by the virion-associated Sin3a-HDAC1 complex.While our studies investigate the virion encapsidation and functional significance of Sin3A-HDAC1 complex in HIV-1 replication , a recent report illustrated the association of NURD , another HDAC1 complex , with the HCMV viral protein UL38 .