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When an MSA is not optimal, then
there are three major types of misplacement of gaps: a)
*shifted gaps*: gap blocks of same size appear shifted horizontally
b) *split gaps*: gap blocks are cut apart vertically and
appear as two gap blocks and c) *shifted and split gaps*,
which is a combination of a) and b).

*Chantal Korostensky*

*1999-07-14*