Scientists have manipulated the electrical signals that help guide flatworms in regenerating their body parts to encourage a flatworm to grow two heads.

Selected Images of the Day from the-scientist.com

From guiding branching neurons in the developing brain to maintaining a healthy heartbeat, there seems to be no job that the immune cells can’t tackle.

In addition to circulating in the blood as immune sentinels, macrophages play specialized roles in different organs around the body.

Following an injury to a Drosophila pupal wing, macrophages swoop in, engulfing debris and aiding in the tissue regeneration process.