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A1, YFP-expressing muscle spindles in deep tissue of tibialis anterior skeletal muscle. YFP is shown in green and DAPI is shown in greyscale, scale bar represents 200 μm. A2, as A1 but without DAPI staining for clarity. B, fine structure of another YFP-expressing muscle spindle. YFP is shown in yellow, scale bar represents 100 μm.
