(a) Assaying for intermolecular interactions. Lane 1,
repeat a; lane 2, repeat b; lane 3, repeat variant b; lane 4, repeat c;
lane 5, repeat variant c. (b) Methylation analysis of
the guanine residues in repeat a. Lane 1, higher-order complex of a
single repeat of a. Guanines inaccessible to DMS are marked with
asterisks. Lane 2, monomer form of a single repeat of a.