All reagents were purchased from Sigma Aldrich unless otherwise indicated. ERK inhibitor SCH772984 (14 (link)) was purchased from Active Biochem and used at a concentration of 1000 nM for in vitro experiments. The MEK inhibitor trametinib was purchased from Selleckchem and used at a concentration of 100 nM for in vitro experiments. All drugs were reconstituted in sterile, dry DMSO, aliquoted, and stored at 80 °C until further use.