Immune functions in the mouse intestine differ by segment.

Researchers hope that “lympho-organoids” could eventually treat lymphedema in humans, but the technique is currently a proof-of-concept.

Collagen tunnels through mouse lymph nodes ferry antibodies into the bloodstream.

Analysis of the bodies of deceased individuals can’t determine what effect these tattoo remnants have on lymph function, but researchers suggest dirty needles aren’t the only risk of the age-old practice.