SDS-PAGE analysis of IL-6 immunoprecipitates of ECCM.

Control immunoprecipitation with normal rabbit serum (lanes 1, 3) and IL-6 immunoprecipitation with an antihuman IL-6 rabbit polyclonal antibody (lanes 2, 4) under nonreducing (lanes 1, 2) and reducing (lanes 3, 4) conditions. Samples were analyzed on an SDS–12% polyacrylamide gel. The positions of molecular weight markers are indicated on the right.