Intact SMGs were surgically removed from each mouse following euthanasia. SMGs were either lysed for RNA or protein, cryopreserved, or fixed in paraformaldehyde (PFA) 4%. After PFA fixation, 4-μm paraffin sections were stained with H&E and visualized in an Axiovert 25 light microscope (Zeiss, NY, USA) at 40× magnification. H&E images were taken with a Nikon 5000 camera (Nikon, Japan). Cryopreserved in vivo SMG tissues were used for immunofluorescence analysis.
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