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other along the right.When the muscle cells on one side shrink, the tail moves in that direction,pushing the fish through the wa- ter.The movement also causes the piece of muscle cells on the opposite side to stretch.This stretching,in turn,produces a sig nal that causes the cells to shrink,which perpetuates(使…持 the swimming motion."Once that cycle starts,these things just start motoring,Parker says. The team chose to test its lab-grown heart cells in robotic fish because of the similarities between swimming and the pum- ping action of a heart,Parker says.In some ways,a fish is a pump, he says.But instead of pumping blood through the body,it pumps it self through the water. For now,though,this sort of research should help scientists