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Representative images of immunofluorescence for calcitonin gene-related peptide-positive (CGRP-positive) in subchondral bone marrow Immunofluorescence staining of CGRP-positive fibers in (A) Sham (B) Sham + US (C) OA, and (D) OA + US. OA animals showed increased CGRP-positive fibers (arrowhead) in subchondral bone marrow space. Scale bar: 100 μm.
