Motif finding--exhaustive
methods
e.g. Sinha and Tompa (ISMB '00):
motif = number of conserved bases + spacers + other
patterns e.g. for transitions (A     G)
assume that motif occurs at least once in the
sequence
rank by z-score (using formulae for estimating mean,
SD of number of occurrences)
statistics non-trivial; no uncertainty available