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What means well conserved<br />

for BLAST?<br />

BLAST works with k-words (words of length<br />

k)<br />

– k is a parameter<br />

– different for DNA (>10) and proteins<br />

(2..4)<br />

word w 1 is T-similar to w 2 if the sum of pair<br />

scores is at least T (e.g. T=12)<br />

Similar 3-words<br />

W 1 : R K P<br />

W 2 : R R P<br />

Score: 9 –1 7 ∑ = 15

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