CCL2 and rheumatoid arthritis: As expected, CCL2/MCP-1 induced significant migration of both HD (Fig 1A) and RA (Fig. 1B) monocytes pre-incubated with medium (HD P = 0.0358; RA P = 0.0205) or isotype control (HD P = 0.0483; RA P = 0.0005).