In aggressive lymphomas, inflammatory messengers reprogram the "conductors" of the immune system, causing lymph nodes structure to collapse. A team led by Simon Haas describes in "Nature Cancer" this ...

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 ...

Structure of a lymph node showing the typical division into different territories for immune cells: B cells are shown in red, T cells in blue, lymphatic vessels in yellow, and stromal cells in cyan.

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.