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Phase-contrast micrographs of non-loaded (a and b) and AuNS-loaded rat alveolar macrophages (c and d). Macrophages were incubated with AuNS for 24 hours. The AuNS appear as dark, opaque regions in c and d (arrow in d). A magnification of 10× was used for a and c, while b and d are magnified by 40×. (AuNS; Gold nanoshell).
