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In bioinformatics, BLAST (basic local alignment search tool) [3] is an algorithm and program for comparing primary biological sequence information, such as the amino-acid sequences of proteins or the nucleotides of DNA and/or RNA sequences.
Note: BLOSUM 62 is the default matrix for protein BLAST. Experimentation has shown that the BLOSUM-62 matrix is among the best for detecting most weak protein similarities. [1] Several sets of BLOSUM matrices exist using different alignment databases, named with numbers.
A BLAST variant called MegaBLAST indexes 4 databases to speed up alignments. [9] BLAT can extend on multiple perfect and near-perfect matches (default is 2 perfect matches of length 11 for nucleotide searches and 3 perfect matches of length 4 for protein searches), while BLAST extends only when one or two matches occur close together. [1] [9]
Protein provides the relevant data to the users such as genes, DNA/RNA sequences, biological pathways, expression and variation data, and literature. It also provides the predetermined sets of similar and identical proteins for each sequence as computed by the BLAST.
Distributed with the latest version of BLAST, this wrapper facilitates parallelization of the algorithm on modern hybrid architectures with many nodes and many cores within each node. [2] Protein: Burdyshaw CE, Sawyer S, Horton MD, Brook RG, Rekapalli B: 2017 CS-BLAST: Sequence-context specific BLAST, more sensitive than BLAST, FASTA, and SSEARCH.
Conserved sequences may be identified by homology search, using tools such as BLAST, HMMER, OrthologR, [25] and Infernal. [26] Homology search tools may take an individual nucleic acid or protein sequence as input, or use statistical models generated from multiple sequence alignments of known related sequences.
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CS-BLAST [1] [2] [3] (Context-Specific BLAST) is a tool that searches a protein sequence that extends BLAST (Basic Local Alignment Search Tool), [4] using context ...