Cardiomyocytes can be sorted to high purity upon staining them with a dye that labels mitochondria. This permits the preparation of pure populations of cardiomyocytes differentiated from stem cells.

Panamanian golden frogs—such as F1, seen here—are native to the rainforests and cloud forests of Panama but haven't been seen in the wild since 2009. Each creature's bright coloration warns predators ...