Immunohistochemical analysis of DDR1 expression in the biopsied tissue of a CSS patient. Original magnification, × 350. (A) Hematoxylin-eosin staining. (B) Stained with the DDR1 antibody. (C) Negative control for the DDR1 antibody. Cells were stained with hematoxylin. Images were captured with an Olympus U-PMTVC microscope (Olympus, Tokyo, Japan) with a UPlan Apo 20×/0.80 NA objective lens, and an Olympus DP11-N. Images were captured with Adobe Photoshop 7.0 (Adobe Systems, San Jose, CA).