Confocal micrograph of “lost” axons - chick interneurons labeled with green fluorescent protein that were transplanted from older into younger embryos. When they encounter unfamiliar territory, the axons create these trails as they try to recognize their pre-programmed trajectory. This image was first published in Developmental Biology 297, 508-21. Honorable Mention, 2011 Olympus BioScapes Digital Imaging Competition®.