Hello all, 

Anyone have any tips for reducing agents for use with the following
crystallization conditions: 

100 mM hepes, pH 7.5, 24% PEG 1500

or

100 mM Tris, pH 8.0, 24% PEG 1500

I've tried BME and DTT (1 mM).  Currently trying out TCEP.  The protein
seems to be sensitive to oxidation, with a selenomet-derivative even more so.  

Thanks!

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