Figure 4
From: Frequent occurrence of recognition Site-like sequences in the restriction endonucleases
The location of RS-like sequences in the 3D structure of REs. The figure shows one subunit of the RE and the dsDNA (the RS). The color code of the ribbon backbone indicates the length of the RS-like strings: yellow = 3, orange = 4, pink = 5, red >= 6. The solid spirals indicate the dsDNA; the red and blue lines are the RSs while the white parts are not RSs. (The EcoRI structure is an exception, there is only a single DNA strand and only one enzyme subunit).