Copyright information:Taken from "Use of adenoviral E1A protein to analyze K18 promoter deregulation in colon carcinoma cells discloses a role for CtBP1 and BRCA1"BMC Molecular Biology 2005;6():8-8.Published online 14 Apr 2005PMCID:PMC1087485.ts were analyzed by Western blotting with an anti-E1A antibody. N- and C-terminal deletion mutants. The E1A-C29, -C79 and -C109 polypeptides cannot be detected with this antibody. Internal deletion mutants. Note that E1A and some of its mutants are very sensitive to proteolysis (white asterisks) in spite of the presence of protease inhibitors. Similar results were obtained in SW613-B3 cells (not shown).