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BLAT, Step 2:<br />

Hit criteria<br />

1)Preprocess<br />

2)Scan<br />

3)Extend<br />

In a constant time we can get the<br />

sequences with a certain k-word<br />

relaxing hit definition -> improve<br />

sensitivity<br />

– allow imperfect hits<br />

• costly, huge hash grows a few times!<br />

➔ shorten k (would lead to FP), but<br />

expect two hits (see BLAST)

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