Figure 2. Differences in the size of water marks generated by the instilled water between the paper towel and the filter paper. Two minutes after instilling aliquots of 20 μl of water on the paper towel (A, upper) and the filter paper (A, lower), the longest diameter of the water marks generated on them was measured. A representative picture (A) and mean±SD of the sizes of the water marks (B) are presented. ***p<0.001.