For each domain, the mean width of the major groove in the contact zone of the domain was calculated with the program Curve+.

Three numbers A (B-C) means: A is the average value of the width among all domains of the family, B is the minimum and C is the maximum.

The dash "-" means that the major groove cannot be determined for the DNA in the contact zone of domains of the family.

One number means that only for one domain of the family the major groove was determined