日韩av大片在线观看欧美成人不卡|午夜先锋看片|中国女人18毛片水多|免费xx高潮喷水|国产大片美女av|丰满老熟妇好大bbbbbbbbbbb|人妻上司四区|japanese人妻少妇乱中文|少妇做爰喷水高潮受不了|美女人妻被颜射的视频,亚洲国产精品久久艾草一,俄罗斯6一一11萝裸体自慰,午夜三级理论在线观看无码

T4 DNA ligase is a type of DNA ligase. DNA ligase catalyzes the formation of phosphodiester bonds at single-stranded DNA breaks in double-stranded DNA in vivo. DNA ligase has important biological functions in organisms. In DNA repair and recombination, DNA ligase plays a role in connecting gaps. In the process of DNA replication, the synthesis of the lagging strand is discontinuous, and DNA ligase connects the discontinuous DNA strand into a continuous DNA strand. It does not contain DNA endonuclease, exonuclease and phosphatase, and does not contain RNA enzyme.