人类牙齿有望像鲨鱼牙齿一样可以再生
<p><span word="Good">Good</span> <span word="news">news</span> <span word="for">for</span> <span word="soda">soda</span> <span word="lovers">lovers</span>: <span word="Scientists">Scientists</span> <span word="appear">appear</span> <span word="to">to</span> <span word="be">be</span> <span word="one">one</span> <span word="step">step</span> <span word="closer">closer</span> <span word="to">to</span> <span word="being">being</span> <span word="able">able</span> <span word="to">to</span> <span word="regenerate">regenerate</span> <span word="teeth">teeth</span> <span word="in">in</span> <span word="humans">humans</span>. <span word="A">A</span> <span word="study">study</span> <span word="in">in</span> <span word="Developmental">Developmental</span> <span word="Biology">Biology</span> <span word="explains">explains</span> <span word="how">how</span> <span word="sharks">sharks</span> <span word="and">and</span> <span word="other">other</span> <span word="marine">marine</span> <span word="life">life</span> <span word="are">are</span> <span word="able">able</span> <span word="to">to</span> <span word="regrow">regrow</span> <span word="teeth">teeth</span> <span word="continuously">continuously</span> <span word="throughout">throughout</span> <span word="their">their</span> <span word="lives">lives</span>.</p><p>告诉碳酸饮料爱好者一个好消息：科学家向人类牙齿再生技术又迈进了一步。《发育生物学》上刊登了一项研究，向我们解释了鲨鱼及其它海洋生物可以终生不断再生牙齿的原理。</p><p><span word="Until">Until</span> <span word="now">now</span>, <span word="that">that</span> <span word="process">process</span> <span word="had">had</span> <span word="been">been</span> “<span word="poorly">poorly</span> <span word="understood">understood</span> <span word="and">and</span> [<span word="remained">remained</span>] <span word="virtually">virtually</span> <span word="uncharacterized">uncharacterized</span> <span word="from">from</span> <span word="a">a</span> <span word="developmental">developmental</span> <span word="genetic">genetic</span> <span word="standpoint">standpoint</span>.” <span word="Researchers">Researchers</span> <span word="at">at</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Sheffield">Sheffield</span> <span word="studying">studying</span> <span word="the">the</span> <span word="embryos">embryos</span> <span word="of">of</span> <span word="catsharks">catsharks</span> <span word="discovered">discovered</span> <span word="a">a</span> “<span word="special">special</span> <span word="set">set</span> <span word="of">of</span> <span word="epithelial">epithelial</span> <span word="cells">cells</span>” <span word="called">called</span> <span word="dental">dental</span> <span word="lamina">lamina</span> <span word="that">that</span> <span word="are">are</span> <span word="responsible">responsible</span> <span word="for">for</span> <span word="regenerating">regenerating</span> <span word="teeth">teeth</span>, <span word="according">according</span> <span word="to">to</span> <span word="a">a</span> <span word="press">press</span> <span word="release">release</span>.</p><p>人们此前对鲨鱼牙齿的再生过程“了解甚少”，认为它“一直是发育遗传理论中的特例”。据报道，英国谢菲尔德大学负责猫鲨胚胎研究的学者发现了一种名为牙板的“特殊上皮细胞群”，它能再次发育出牙齿。</p>
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