Figure 1.

Change in blood flow at central recording sites 1 cm distant from the site of administration of histamine or noradrenaline in pretreated and untreated skin. Increases in blood flow after the noradrenaline iontophoreses were greater in untreated than pretreated skin (P< 0.05). The box-and-whisker plots in Figures 1 and 2 represent the range of scores (whiskers), the 25th and 75th percentiles (the outline of the box represents the interquartile range), and the median (the line through the box)