The polyclonal antibody against Plexin-B1 is specific for the molecule.

The specificity of the Ab against Plexin-B1 was assessed by Western blot analysis after immunoprecipitation with an anti–Plexin-B1 monoclonal Ab (A) and further confirmed by cytofluorograph analysis (B) on the following cells: 1, MLP/Plex-B1; 2, follicular dendritic cell line (FDC-1); 3, normal in vitro activated T lymphocytes; and 4, MLP wild type.