Recombinant human mitogen-activated protein kinase kinase 1 (MAP2K1/ MEK1)
produced in Sf9 cells is a single polypeptide chain with a 6His tag at the N-terminus.
It contains 405 (12+393) amino acids, and having a predicted molecular mass of
approximately 44.7kD, but migrates in SDS-PAGE with an apparent molecular mass
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