Western blot analyses of protein samples were performed as described previously using rabbit anti-VSV-G (diluted 1:5,000; Sigma), rabbit anti-Hcp (diluted 1:5,000) and detected with anti-rabbit horseradish peroxidase-conjugated secondary antibodies (diluted 1:5,000; Sigma)6 (link). Western blots were developed using chemiluminescent substrate (Clarity Max, Bio-Rad or SuperSignalâ„¢ West Femto Maximum Sensitivity Substrate, Thermofisher) and imaged with the ChemiDoc Imaging System (Bio-Rad).