Restriction analysis of recombinant vectors. Lanes 1, 2: Marker; Lanes 3, 4: pEGFP-Sp before and after being digested by Acc65Iand AgeI; Lanes 5, 6: pEGFP-Cp before and after being digested by Acc65Iand AgeI; Lanes 7, 8: pEGFP-Xp before and after being digested by Acc65Iand AgeI; Lanes 9, 10: pEGFP-preSp before and after being digested by Acc65Iand AgeI.