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Atomic force microscopy (AFM) images of bare-graphene oxide (a) and graphene oxide–bovine serum albumin (BSA) complex (b). Reprinted with permission from [52]. Copyright (2015) American Chemical Society. TEM images of a single 40 nm AuNP (c) and 40 nm AuNP–human serum albumin (HSA) complex (d). Reproduced from [48] with permission from The Royal Society of Chemistry.
