In a longitudinal analysis of 267 SLE patients over a one year follow up, Bauer et al. [16] found that serum levels of the IFN regulated chemokines CCL2 (MCP-1), CCL19 (macrophage inflammatory protein, MIP-3B), and interferon gamma-inducible protein -10(IP-10) significantly outperformed standard serological tests. The gene discussed is CCL19; the disease is systemic lupus erythematosus.