WA was purchased from Alta Vista Phytochemicals (Hyderabad, India), and biotinylation of WA was performed by Dr. P. Van der Veken (WA-BT; Universiteit Antwerpen, Belgium). Both formulations were stored as 20 mM stocks in DMSO at −20 °C as previously described [48 (link),107 (link)]. IBR (IMBRUVICA®) stock solutions were obtained from Pharmacyclics (Sunnyvale, CA, USA). Antibodies BTK (3533) and GAPDH (2118S) were obtained from Cell Signaling Technology (Danvers, MA, USA).
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