Effects of recombinant proteins on adherence of B. burgdorferi to laminin, as measured by ELISA. Results for each protein are illustrated relative to control experiments lacking added protein. All added ErpX derivatives significantly affected adherence to laminin: rErpX-17 (P=0.0009), and rErpX, rErpX-12, rErpX-13 and rErpX-15 (all P<0.0001). Bb, B. burgdorferi.