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Effect of an additional ethanol wash after RNA precipitation. Code 1=single ethanol wash, 2=double ethanol wash. Boxplots show that a) 260/280 ratio undergoes no significant improvement (p = 0.76); b) 260/230 ratio has significant improvement with the additional step (p<0.001).
* p<0.05 (Two sample Wilcoxon rank sum test with continuity correction).
