source of labeled GTP-gammaS

Casey via (by ydenberg from
Fri May 30 14:06:35 EST 2008

I've been trying to get a nucleotide exchange assay working for about
4 years on and off and I recently discovered that Amersham has
discontinued their GTP-[gammaS35].  Does anyone have a recommended
source for the this reagent?  I was buying in quantities of 100 uCi
but I can adapt.

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