an interesting way to compare structures from the same protein sequence is
reported here :
acta cryst D56 714-721, 2000 "objective comparison of protein structures :
error-scaled difference distance matrice"
acta cryst D60 2269-2275, 2004 "domain identification by iterative
analysis of error-scaled difference distance matrices"
both are by T. Schneider, might find a couple others out there
HTH
-bryan
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