Robustness of our results was confirmed by high bootstrap support of all nodes in the trees . this result contradicts the batrachia hypothesis ( a salamander + frog grouping ) , and is consistent with bolt ' s hypothesis ( 1991 ) basing on the morphological data . the result was also supported by previous molecular studies based on mitochondrial and nuclear rrna data 这个结果与蛙类假说是相矛盾的，与bolt ( 1991 )中国泽蛙线粒体基因组结构及种群系统地理学研究在形态学基础上提出的绒蝶类和蚓螺类为姐妹群关系的假说相一致，并得到建立在线粒体和核trna基因数据基础上的许多分子研究的支持。
2.
3 the comparison of mitochondrial genomes and phylogentic relationships of amphibian there still is a lack of consensus regarding living amphibian phylogenetic relationships . the most widely accepted hypothesis , based on morphological data , supports the monophyletic origin in the late paleozoic ( 300 mya ) of the three living orders in the class amphibia and a sister - group relationship between caudata and anura ( the batrachia hypothesis ) to the exclusion of the gymnophiona 3两栖类动物的线粒体基因组结构比较和系统发生关系现存两栖类的三个目的系统发生关系仍然没有统一意见，最广泛被接受的假说，是建立在形态学证据基础上，支持现生的两栖类三个目在古生代后期( 300mya )单系起源，并且无尾类和有尾类为姐妹群关系(蛙类假说) 。
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Magainin is the skin secretion product of batrachia under the eriviroment pressure , which can be used to accelerate the fusion rate of wound and resist the infection . it can inhibit the growth of bacteria and fungus with the lowest concentration ; protegrin is isolated from porcine leukocyte hi 1993 and is useful as antiviral agents Magainins是爪蟾的皮肤在一定的环境压力下分泌出的抗感染和促进伤口愈合的成分，低浓度便可抑制许多细菌和真菌生长； protegrin是1993年从猪的中性白细胞中分离得到，研究发现它具有抗爱滋病毒的功能。
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