Fig. 6.

Scatterplots of the log 2 transformed protein abundances of all quantifiable proteins in the colon biopsies, combined by the mean preservation method wise. The protein abundances are plotted against one another on the x- and y-axes, respectively. Correlations between measured protein abundances using the different methods are represented by Pearson⿿s correlation coefficients (r), where r = 1 signifies a perfect correlation. Protein abundances in directly frozen (DF) colon biopsies was compared to (a) RNAlater, (b) immediate formalin-fixed, paraffin-embedded (iFFPE), or (c) 30 min stored formalin-fixed, paraffin-embedded (sFFPE), and (d) iFFPE and sFFPE are compared. In all cases r-values > 0.94 were calculated indicating a good correlation. Lines indicates a four fold protein abundance difference in (a⿿c), and a two fold protein abundance difference in (d).