Objective To construct the expression vector of Bcl-2-associated transcription fac-tor 1 (BTF) fused to red fluorescent protein ( RFP) and examine its expression in rat vascular smooth muscle cells ( VSMCs) in order to provide an experimental foundation for further studying the interaction of BTF and other proteins in cells and the action mechanism .Methods Btf gene was amplified by PCR with the cDNA of peripheral white blood cells as the template , and inserted into the red fluorescent protein expression vector pDsRed-N1 to obtain the recombinant plasmid pDsRed-N1-Btf, which was then transfec...