Structure of a lymph node (IMAGE) Centro Nacional de Investigaciones Oncológicas (CNIO) Caption Structure of a lymph node whose endothelial cells (green) are capturing the nanovesicles called exosomes ...

Tumors, such as melanoma, release nanovesicles called exosomes (gray) that travel and lodge in the lymph nodes. There they corrupt the behavior of lymph cells. The lymphatic vessels (green) branch out ...

If you've been hopping between arms for booster shots, a new study suggests that your lymph nodes remember exactly where you first got jabbed and perform far better when you return to that same arm.