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Photomicrographs of stem cell transplantation method. (A) Visualization of the round window after opening the bulla. (B, C) Note the tip of a needle of a Hamilton syringe is inserted into the most basal turn of the scala tympani, where neural-induced human mesenchymal stem cells (nhMSCs) or Hanks balanced salt solution (HBSS) were injected (C, H&E staining, × 40).
