Figure 7.

Interactions of breast cancer cells with the brain endothelium in vivo. EmGFP‐4T1 mouse breast cancer cells were injected into the circulation of mice. Ultrasections were prepared 5 days after the inoculation from brain tissue containing fluorescent tumour cells. Representative transmission electron micrographs show tumour cells surrounded by endothelial protrusions. Arrowheads indicate membrane protrusions. Images in (B) are higher magnifications of the respective images in (A). EC = endothelial cell