The vectors for Ter HR reporters described were constructed by conventional cloning methods using a previously described 6xTer-HR and RFP-SCR reporters10 (link),26 (link). pHIV-NAT-CD52 vectors were derived from pHIV-Zsgreen, a gift from Bryan Welm and Zena Werb (Addgene plasmid # 18121) 52 (link). Ter-containing plasmids were amplified in JJC33 (Tus) strains of E. coli. siRNA SMARTpools were purchased from Dharmacon. All plasmids used for transfection were prepared by endotoxin-free maxiprep (QIAGEN Sciences, Maryland, MD).