BMPR1A and neoplasm: (B) Sections of allografts from mice orthotopically injected with control tumor organoids (upper panels, five animals), organoids with shRNA targeting Shh (middle panels, five animals) or organoids with shRNA targeting Bmpr1a (lower panels, five animals) were stained with H and E. Serial sections were immunostained for Ck5 (green) and Ck18 (red).