Zebrafish are extremely important as a model organism in developmental biology.
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Scientific term. Common 模式动物 include 小鼠 (mouse), 果蝇 (fruit fly), 斑马鱼 (zebrafish), 线虫 (C. elegans) and 非洲爪蟾 (Xenopus). Note 模式 here means 'model/template', not 'mode'.