Comparison of the average salt bridge interactions distances between Lys (K) and Asp (D) along the 300 ns simulation of the wild-type and its mutants of tandem repeat cylindrin along the three out of register interfaces. Red for wild-type (WT-TR), magenta for V4GV8G-TR, brown for V4AV8A-TR, blue V2L-TR, and green for VTL-TR. The results are the average of three independent 300 ns simulations of each system. Here, a stands for strand number and b for residue number in aKb- aDb designation of the salt bridge distance of the wild type tandem repeat cylindrin and mutants.