Immunofluorescence staining of frozen sections on slides was performed by the previously described method (Prasad et al., 2016 (link)). After staining, images were captured with a fluorescent microscope (Axiophot II; Zeiss, Jena, Germany) equipped with a cooled AxioCam HRc CCD camera (Zeiss) and MetaMorph version 4.6.5 software (Molecular Devices).
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