GAB1 and cytomegalovirus infection: As shown in Fig. S1 in the supplemental material, expression of a NAB1 shRNA in the context of HCMV infection does not significantly affect UL138 expression compared to the parental ΔmiR-US5-2 virus, indicating that miR-US5-2 targeting of GAB1, and not NAB1, mediates the effect of the miRNA on UL138 protein levels.