In the Dec. 9 SN: Lessons from the Pliocene, searching for new ways to fight MS, a supernova on repeat, the great gene drive debate, spider sleep secrets, an ailing boy gets new skin, kleptopredation and more.
ANOTHER WRINKLE The outer layer of the human brain has distinctive folds. Work with brains growing in lab dishes is showing how the structures may form.
BREAKING AWAY Breast cancer cells (shown growing in a lab dish) move through the body in clusters. New research may shed light on how the clusters enter the bloodstream.
Tom Misteli, Karen Meaburn/NCI Center for Cancer Research
PUMP IT UP A new type of CRISPR/Cas9-based gene therapy turned on muscle-building genes in mice that have muscular dystrophy. Muscle fibers (magenta) from mice that got the therapy (right) were bigger than fibers from untreated animals (left).