Gene targeting strategy for B-hDLL3 mice. The exons 2-7 of mouse Dll3 gene that encode the extracellular domain were replaced by human DLL3 exons 2-7 in B-hDLL3 mice.

Strain specific analysis of DLL3 gene expression in wild type (WT) mice and B-hDLL3 mice by RT-PCR. Mouse Dll3 mRNA was detectable in testis of WT mice (+/+). Human DLL3 mRNA was detectable in homozygous B-hDLL3 mice (H/H) but not in WT mice (+/+).

Strain specific DLL3 expression analysis in homozygous B-hDLL3 mice by western blot. Testis and lung were collected from wild type (WT) mice (+/+) and homozygous B-hDLL3 mice (H/H), and analyzed by western blot with anti-DLL3 antibody. DLL3 was detectable in WT mice (+/+) and homozygous B-hDLL3 mice (H/H) due to the cross-reactivity of the antibody.