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Effect of an additional chloroform wash after phase separation. Code 1 = single chloroform wash, 2 = double chloroform wash. Boxplots showing that 260/280 ratio underwent no significant change (Two sample Wilcoxon rank sum test, p = 0.18). 260/230 ratio shows significant decline with the second wash (p = 0.003).
* p<0.05 (Two sample Wilcoxon rank sum test with continuity correction).
