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Mast cell (MC) heterogeneity in synovia. (a) Immunofluorescence of synovia from an early rheumatoid arthritis (RA) patient showing MC with single positivity for tryptase (red)—MC_T; (b) MC double positive for tryptase (red) and chymase (green)—MC_TC. Nuclei in blue (DAPI). Line at 20 µm.
