Examination of alternative promoter usage at the 5′ end of the Notch1 gene.

<p>Transcripts containing the alternative (E1a) and conventional (E1c) exon 1 were amplified using specific primers designed by Gomez-del Arco et al. The levels in each pre-tumor or tumor samples were compared to the average levels in wild type mice obtained from 6 FVB/N (A) and 4 C57BL/6 (B) mice, respectively.