to identify cis-acting dna elements responsible for this type of regulation , we constructed a plasmid in which cat gene expression was driven by about 1 kilobase of upstream k-fgf human dna sequences , including the putative promoter , and transfected it into undifferentiated f9 ec cells or hela cells as prototypes of cells which express or do not express , respectively , the k-fgf proto-oncogene .
C0086418
human
C0919466
k-fgf