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Figure 4 Mast cell (MC) numbers are higher in stenotic than in normal aortic valves. (A) The total number of MCs (cells/mm2) in stenotic (n = 86) and normal (n = 11) aortic valves. (B) The number of chymase-containing MCs in stenotic (n = 11) and normal (n = 11) aortic valves. Lines indicate medians.