Hi, 

I've extracted RNA from fixed cells,  but ratios measured with nanodrop are low : 260/280 = 1,7 and 230/260 = 1,35 ! 

I used trizol,  and I added two phenol/chloroform steps. Then,  the ethanol steps (100% ethanol for precipitation and two washing with 70% ethanol )... When I don't fix cells,  ratios are perfect... 

Have Anyone a protocol to purify rna of fixed cells ?

Thanks ! 

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