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SEM micrographs of umbilical cord tissue post-processing. (A) SEM image of preserved cross-linked collagen structures (scale bar: 300 nm). (B) SEM image of preserved random directional structural composition of collagen fibers (scale bar: 300 nm). (C) SEM image of multidirectional linkage of collagen fibers (scale bar: 1 μm) [30].
