NERVE PROTECTORS The glowing cells in this micrograph of a mouse’s optic nerve help shield electrical signals passing between eyes and brain. The Brainbow technique allows scientists to visualize how the cells work together.
Courtesy of A. Chédotal/Institut de la Vision
SHRIVELED Tumors implanted in adult female fruit flies cause healthy ovaries (one shown, left) to waste away. The wasting (right) is caused by a protein secreted by cancer cells. The bar shown represents 500 micrometers.
D. Bilder and A. Figueroa-Clarevega/Univ. of California, Berkeley
HOT STUFF Capsaicin, the stuff that gives chili peppers their heat, relieves pain by a previously unknown process.