Nonvertebrates including hydras and flatworms can grow new brains, digestive organs, nerve cords, and muscle even when huge chunks of their tissue are removed, Levin says. Regenerative capabilities are rarer
and much less powerful among
vertebrates. Fish can regrow fins—including skin, bone, blood vessels, nerves, and connective tissue—as well as kidney tissue and heart muscle.
by Sophie L. Rovner |
August 02, 2010