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(A) Scientists call this unidirectional regeneration.
(B) Humans aren’t completely without regenerative talents.
(C) The same thing happens for lobsters, salamanders, and many other animals.
(D) When it comes to regeneration, few animals can equal the magic of the planarian.
(E) This type of regeneration is demonstrated in a few animals, such as hydras and sea stars. (BD) They hope that this line of research will make regeneration possible in humans someday.