Western blotting was performed as previously described39 (link). The conditions and duration of treatments of the cells before protein isolation are described in the text and the figure legends. Primary antibodies included p-ERK Thr204/205, ERK, p-MEK Ser217/221, MEK, anti-HA (clone C29F4) and GAPDH (all from Cell Signaling Technology, Danvers, MA), BRAF (H-145) and CRAF (E-10) (both from Santa Cruz biotechnology, Santa Cruz, CA), anti-MYC and anti-actin (Sigma Aldrich, St. Louis, MO). Secondary antibodies were HRP conjugates (Santa Cruz biotechnology, Santa Cruz, CA). Densitometry of bands was performed by using ImageJ program.
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