This is the zebrafish. The zebrafish lives in tropical freshwater and is a member of the minnow family. It enjoys zooplankton, insects, and phytoplankton; if those aren't available, it will enjoy almost anything else. Those who keep aquariums like to populate them with zebrafish. The zebrafish can grow a new heart.
Spaniards recently lopped off twenty percent of zebrafish ventricle, and stood by as the remaining cells began to glow youthful green, and regenerate.
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