Immunohistochemical labeling. Myeloperoxidase of spleens from a wild-type control (A) and TSLP transgenic (B-C) mice. Myeloperoxidase staining of myeloid cells is increased in transgenic mice. Myeloperoxidase-positive cells are indicated by the purple staining the cytoplasm. Results are representative of 3 independent experiments. Scale bar = 50 μm (A-B) and 100 μm (C).