that HHV-6A is a strong inducer of apoptosis .
The cell death was associated with activation of caspase-3 and cleavage of DNA repair enzyme poly ( ADP - ribose ) polymerase ,
Annexin V - PI staining and electron microscopy indicated that HHV-6A is a strong inducer of apoptosis .
The cell death was associated with activation of caspase-3 and cleavage of DNA repair enzyme poly ( ADP - ribose ) polymerase , which is known to be an important substrate for activated caspase-3 .