Viral constructs
(A) Schematic representation of OAd-NIS vectors. Constructs are based on adenovirus type 5 (Ad5) and include deletion of the 12.5K, 6.7K, gp19K, RID-α, RID-β, and 14.7K genes from the E3 region. The ADP gene was removed from ADP– vectors. The vectors are equipped with the Ad5/Ad3-modified fiber to overcome coxsackie Ad receptor (CAR) deficiency and a Cox2 promoter to restrict replication and gene expression to permissive tumors. (B) PCR verification of ADP presence or absence in each vector.