科学家正在研究墨西哥钝口螈（Axolotls，学名Ambystoma mexicanum，俗称“六角恐龙”）重生四肢的关键，希望有朝一日也用在人类，找到重生手指甚至整条手臂的方法。论文发表在《Nature Communications》期刊。

WASHINGTON, July 4 (Xinhua) -- The U.S. Congress on Thursday passed a sweeping tax and spending package, with the House of Representatives approving it in a narrow 218-214 vote, sending the "One Big ...