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The mean density of MPO in kidney tissue of IRI-AKI rats treated with BMSC after different pretreatments on 3 days. (a) Immunohistochemical staining of MPO, original magnification 400×. (b) The mean density of MPO. Mean density = IOD/AOI (IOD, integrated optical density; AOI, area of interest). Group with symbol # versus groups with symbol ### or Δ, both P<0.05; group with symbol ※ versus groups with symbol ### or Δ, both P<0.05.
