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(A) Representative photomicrographs indicated more macrophage and neutrophil infiltration in 20-month-old ptAadc–/– mice than 20-month-old wild-type mice. Original magnification: ×160. (B) FACS analysis indicated increased leukocyte, T8 lymphocyte, and macrophage infiltration in old ptAadc–/– mice than old wild-type mice (*P < 0.05, **P < 0.01; n = 3).
