RecBCD e、RecBCD切割产生3'单链末端 protein 111 BINDING TO END OF DOUBLE HELIX FOLLOWED BY MOVEMENT MIIIEAIMIIAIAMAAMIIIIIMINI recognition sequence NICKING OF traveling loop RECOGNITION of single-stranded SEQUENCE DNA IIIIITT DISPLACEMENT OF SINGLE-STRANDED WHISKER" RHHHHHO e、 RecBCD 切割产生3’单链末端