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
IT’S HERE Flu activity is widespread across the county, with 32 states and Puerto Rico reporting high activity (orange to red) as of January 13, according to the U.S. Centers for Disease Control and Prevention.
BUGGED In this scanning electron microscope image, Streptococcus pyogenes bacteria (yellow) are shown on top of a white blood cell. Different strains of the bacteria trigger a different reaction from the immune system thanks to extra genes that vary among strains.