Part 7/13:
A striking example is the regeneration of limbs in frogs. While adult frogs do not normally regenerate their legs, Levin’s research shows that by providing a simple trigger—a prompt that guides cells into a regenerative state rather than a default injured state—cells can initiate the entire process of limb regrowth. The process doesn’t involve explicit instructions on how to form toes or organize tissues but rather a communication that shifts the cells’ entire developmental “trajectory.”