Anti-MEK1 (Phospho-Ser217)

Anti-MEK1 (Phospho-Ser217) — Y011205 — is a rabbit polyclonal antibody detecting MAP2K1/MEK1 (~44–45 kDa) phosphorylated at Ser217 in the activation loop by Raf kinases, a direct readout of RAS–RAF–MEK pathway engagement used to assess BRAF/KRAS oncogenic signalling and RAF inhibitor pharmacodynamics. Validated for WB and IHC in human, mouse, and rat. Store at –20 °C.