Figure 2. Double labeling of lymphatic and CD31-positive vessels in RA synovial tissues.

Lymphatic vessels were detected by immunoperoxidase (brown immunostaining) detection of podoplanin and double immunofluorescent labeling (red fluorescence) of CD31. The same field was photographed by light or fluorescent microscopy to show the position of CD31+ (arrowheads) and podoplanin+ vessels (arrows). Light microscopy image was inverted and merged with CD31 fluorescent image of the same field to show the relative position of podoplanin (blue) and CD31 (red) labeling.