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EMBOSS Needle Sequence Alignment Tool

Yapay zekadan makale özeti

Function and Algorithm: Needle reads and aligns two sequences using Needleman-Wunsch algorithm
Algorithm explores all possible alignments and chooses best one
Scoring matrix contains values for every possible residue/nucleotide match
Gap penalties are subtracted from alignment score
Usage and Parameters: Requires two input sequences and optional scoring matrix
Supports various sequence formats including EMBOSS USA and database entries
Outputs alignment in standard EMBOSS format
Allows customization of gap penalties and alignment width
Technical Details: Needs memory proportional to product of sequence lengths
Memory usage is approximately 8 bytes for 10Mx1K sequences
Can handle partial overlaps and internal alignments
No penalty for hanging ends of overlapping sequences
Alternatives: Water finds best region of similarity between sequences
Stretcher better suited for very long sequences
All bugs should be reported to EMBOSS bug team