Figure 1

Expression plasmids used in this study. Numbers in parenthesis represent the length of each vector in base pairs. , SV40 early/late poly A signal;
, β-globin poly A signal;
, downstream SV40 untranslated region. CMV, immediate–early enhancer/promoter; dTNFR, dimeric human tumour necrosis factor receptor 2; Luc, luciferase gene; Luc+, improved luciferase gene; Ptet, tetracycline responsive promoter; rtTA, reverse tetracycline transactivator.