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Characteristics of the human acellular amniotic membrane (HAAM). a Gross view of the HAAM before implantation. b, c Images of hematoxylin and eosin (H&E) staining indicate the resident cells were completely removed after the decellularisation procedures. d, e Cross-sectional morphology of the HAAM after H&E staining. f, g Scanning electron microscope (SEM) results of the HAAM illustrating the collagen structure
