SDS-PAGE and standard Western blot analysis, based on equalized amounts of the total cell lysates, were performed as described previously in [64 (link)]. The antibodies used for staining were mAb-HA (H9658, Sigma-Aldrich, USA), pAb-Flag (F7425, Sigma-Aldrich), mAb-IE1p72 (P63-27) [65 (link)], and mAb-pp28 (both kindly provided by William J. Britt, Dept. Pediatrics Microbiol., Univ. Alabama, Birmingham, AL, USA), mAb-UL44 (kindly provided by Bodo Plachter, Virology, Univ. Mainz, Germany), and mAb-actin (A5441, Sigma-Aldrich).
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