The rats were deeply anesthetized with ketamine and perfused transcardially with 100 mL normal saline (0.9%). Liver, kidney, and lung specimens were fixed in 4% buffered formalin and embedded in paraffin. Sections (14 µm) from paraffin-embedded tissue blocks were cut using a microtome (RM2125 rotary; Leica Microsystems, Wetzlar, Germany) and collected on silane-coated slides (Muto Pure Chemical, Tokyo, Japan) for histology and immunohistochemistry and stored at −70°C.
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