Cell culture materials were purchased from Invitrogen, FR900359 (previous commercial name UBO-QIC) was isolated and purified as described elsewhere (24 (link)), YM-254890 was from Wako Chemicals GmbH. Primary antibodies to detect the human influenza hemagglutinin (HA) epitope tag (YPYDVPDYA) and α-tubulin were from Roche Applied Science and LifeSpan BioSciences, respectively. The horseradish peroxidase–conjugated secondary antibodies, goat anti-mouse IgG, and goat anti-rabbit IgG were from Sigma-Aldrich and Antibodies-online GmbH, respectively. All other reagents were purchased from Sigma-Aldrich if not stated otherwise.
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