To find dnaase in the earthworm the tissue extract of earthworm with different concentration reacted with rna , circular dna , linear dna for an hour at 37 , then the producetion was detected by 1 % agrose gel . the tissue extract of earthworm , the tissue protein extract of earthworm and the tissue extract of earthworm without protein reacted with pbv220 - r - inf for an hour at 37 , then the producetion was detected by 1 % agrose gel . 2 双胸蚓组织中dna酶的发现用不同浓度的双胸蚓组织提取液与rna 、环状dna及线状dna在37反应1小时后用1的琼脂糖凝胶电泳对其反应产物进行观察；双胸蚓组织粗提取液、双胸蚓组织蛋白粗提取液及双胸蚓组织去蛋白提取液分别与pbv220 - ? inf质粒37反应1小时后用1的琼脂糖凝胶电泳对其反应产物进行观察。
