Histologic examination of normal skin demonstrates small numbers of perivascular cells, with darkly stained ovoid nuclei and granular cytoplasm on hematoxylin and eosin staining. The cells demonstrate metachromasia of the cytoplasm when stained with Giemsa stain. Which of the following products would these cells be most likely to secrete? A. Bradykinin B. Complement factor 3a C. Histamine D. Interleukin 2 E. Nitric oxide

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