MATCHER : Finds the best local alignments between two sequences (EMBOSS)
Some explanations about the options
input Section- enter either the name of a file or the actual data
- if you are using Netscape 2.x or later, you can select a file by typing its name, or better, by selecting it with the Netscape file browser (Browse button)
- OR you can type your data in the next area, or cut and paste it from another application.
- (but not both)
advanced Section- Number of alternative matches (-alternatives)
- This sets the number of alternative matches output. By default only the highest scoring alignment is shown. A value of 2 gves you other reasonable alignments. In some cases, for example multidomain proteins of cDNA and gemomic DNA comparisons, there may be other interesting and significant alignments.
- Gap penalty (-gappenalty)
- The gap penalty is the score taken away when a gap is created. The best value depends on the choice of comparison matrix. The default value of 14 assumes you are using the EBLOSUM62 matrix for protein sequences, or a value of 16 and the EDNAFULL matrix for nucleotide sequences. Allowed values: Positive integer
- Gap length penalty (-gaplength)
- The gap length, or gap extension, penalty is added to the standard gap penalty for each base or residue in the gap. This is how long gaps are penalized. Usually you will expect a few long gaps rather than many short gaps, so the gap extension penalty should be lower than the gap penalty. An exception is where one or both sequences are single reads with possible sequencing errors in which case you would expect many single base gaps. You can get this result by setting the gap penalty to zero (or very low) and using the gap extension penalty to control gap scoring. Allowed values: Positive integer
- Sequence format
- The sequence will be automatically converted in the format needed for the program
- providing you enter a sequence either:
- in plain (raw) sequence format or in one of the following known formats:
- IG,GenBank,NBRF,EMBL,GCG,DNAStrider,Fitch,fasta,Phylip,PIR,MSF,ASN,PAUP,CLUSTALW
- You may enter in the text area a database entry code, or an accession number, in this form:
database:entry_name
or:database:accession.- enter either the name of a file or the actual data
Pise form generator version: 5.a (16 Dec 2002 11:54)
