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| BLAST--protein or DNA |
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| homology |
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| NCBI server |
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| alignment of two protein or DNA sequences |
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| starts with short matching words (no gaps) whose |
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| score exceeds a (user-adjustable) threshold |
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| (actually, pairs of short words on same diagonal) |
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| extend all short matches |
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| allow
gaps |
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| null test based on random background model |
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