Abstract
The number of macrophages (Mph) in the synovial membrane is greatly increased in rheumatoid arthritis (RA) (1) and these cells also predominate in the rheumatoid nodule (2). It is not clear if this results from a normal response to chemotactic factors, or might be due to abnormal behaviour of RA-Mph. The purpose of the present study was to determine whether RA-Mph migrating to skin windows (SW) might show changes in phenotype which differ from normal Mph.