Investigation of FOXP1 isoform expression using Western blotting. (A) Western blotting of the OCI-Ly3 ABC-like DLBCL cell line with the JC12 monoclonal antibody or an anti-FOXP1 polyclonal antibody demonstrates the predominance of smaller isoforms. (B) Western blotting of a panel of cell lines using the JC12 antibody demonstrating high-level expression of the smaller isoforms in the OCI-Ly3, OCI-Ly10, and HLY-1 DLBCL cell lines.