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Jul 21, 2025 · The Basic Local Alignment Search Tool (BLAST) finds regions of local similarity between sequences. The program compares nucleotide or protein sequences to sequence databases and calculates the statistic...
Apr 12, 2022 · 本文详细介绍了序列比对的基本概念，包括BLOSUM62打分矩阵、起始空位与延伸空位罚分，以及needle和water算法。接着，重点讲解了BLAST算法的工作流程，如seeding、findneighborhoodwords、indexdatabase和extending，并提到了统计显著性检验中的Evalue。最后，简述了PSI-BLAST如何利用第一次搜索结果构建PSSM矩阵进行迭 ...
BLAST（Basic Local Alignment Search Tool）局部相似性基本查询工具。是由美国国立生物技术信息中心（NCBI）开发的一个基于序列相似 ...
The Basic Local Alignment Search Tool (BLAST) finds regions of local similarity between sequences. The program compares nucleotide or protein sequences to sequence databases and calculates the statistical significance...
Basic Local Alignment Search Tool BLAST (Basic Local Alignment Search Tool) is a tool that compares nucleotide or protein sequences to sequence databases. It is extensively used to identify sequence similarity and hom...
3 BLAST数据库搜索基本策略 BLAST数据库搜索采用启发式算法以提高搜索速度,该算法的基本策略是找出序列中的保守片段并向两侧延伸。 例如, 人的血红蛋白有9种不同类型, 以alpha 珠蛋白(UniProt数据库序列条目名 HBA_HUMAN, 简称HBA) 为例,BLAST搜索基本思路如下。
Program Selection Optimize for Optimize for Highly similar sequences (megablast) Optimize for More dissimilar sequences (discontiguous megablast) Optimize for Somewhat similar sequences (blastn) Choose a BLAST algorit...
