Inked mice hint at how tattoos persist in people
Immune cells pass pigment from one generation to the next
![tattoo](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/03/031518_dg_tattoo_feat.jpg?fit=860%2C460&ssl=1)
TAIL TATS When researchers tattooed mouse tails, the only cells found with ink inside were macrophages. The tattoo appeared the same before (left) and after (right) ink-holding macrophages were killed, because it was recaptured by new macrophages.
A. Baranska et al/J. Expt. Med. 2018