Ressed with the Roc1a promoter and regulatory regions, and the chimeric proteins contain an amino-terminal V5 tag. B, Control Roc1a and Roc1b or ANBR and BNAR constructs were transfected into S2 cells and cellular extracts were immunoprecipitated with anti-V5 antibodies and probed for the presence of Cul1 and Cul3 by immunoblotting. C, Control Roc1a and Roc2 or AN2R and 2NAR constructs were transf