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Commercial standard protein ladder/marker >250? - (May/14/2012 )

Does anyone know if large molecular weight protein markers/ladders exist in the market today? Planning to run a Western to detect a 300-400kDa protein and all my markers go up to 250kDa max.

-science noob-



alternatively, you can mix your own reference standard by buying purified proteins of wished size, f.i. at SIGMA

-Inmost sun-