Figure 5.

Microscopic sections of synovial tissue from a patient with rheumatoid arthritis stained with the STRO-1 antibody. In the bone marrow STRO-1 reacts with stromal elements that are progenitors of fibroblasts (CFU-F) [55], but staining in the synovium is limited to perivascular mesenchymal cells (pericytes). JS, joint space.