Reduction in radiation-induced fibrosis mediated by serum amyloid P (SAP). Hamsters were exposed to radiation (40 Gy) on day 0. At subsequent time points, cheek pouches were removed, sectioned and stained with haematoxylin and eosin, and extent of fibrosis was assessed. Original magnification: left, × 11; right × 200 (region in the inset box). Bars represent the mean ± SEM of four animals per group.