analysis of these sequences led to the identification of enhancerlike dna elements which are part of the 3 ' noncoding region of k-fgf exon 3 and promote cat expression only in undifferentiated mouse f9 or human nt2/d1 ec cells , but not in hela , 3t3 , or differentiated f9 cells , therefore mimicking the physiological expression of the k-fgf proto-oncogene .
C0015295
exon
C0007634
cells