KRT5 and infection: Approximately 24 hours post-transfection (hpt), cells were infected with a low multiplicity of infection (MOI) (0.01) of recombinant KSHV derived from the Bac16 construct, lacking both K3 and K5 genes and also expressing green fluorescent protein (GFP) from a constitutive promoter, or cells were left uninfected as controls.