Additional file 4.
Phosphorylated PDGFRβ expression in skin biopsies from Patient 4 (rituximab treated). A and B, biopsy taken at baseline; C and D, biopsy taken at 6 months. B and D, higher magnification of the areas included in the boxes in A and C, respectively. Red arrows indicate presence of spindle-like cells that express phospho-PDGFRβ. Streptavidin-biotin peroxidase: A and C, ×100; B and D, ×400.
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Daoussis et al. Arthritis Research & Therapy 2012 14:R145 doi:10.1186/ar3879