功能简介
分析模块，利用blastn程序，输入Fasta格式的核酸序列文件，与NT数据库进行比对，输出NT数据库注释结果。
注意
数据库比对需要大量的时间，如果输入的序列条数过多，会导致blast程序进入假死状态。建议，每次输入的序列数目不要太多。如果，序列条数过多，将序列文件切割成多个小文件，进行分析。
输出格式
Column | NCBI name | Description |
1 | Score | Score |
2 | E-Value | E-Value |
3 | HSP-Len | Length of Match |
4 | %-Ident | Percentage of Identical Bases in Match |
5 | %-Simil | Percentage of Similar Bases in Match |
6 | Query-Name | Query Name |
7 | Num-Rds | --- |
8 | Q-Len | Total Length of Query Sequence |
9 | Q-Begin | Starting Position of Match in Query |
10 | Q-End | Ending Position of Match in Query |
11 | Q-Frame | Query Frame |
12 | Hit-Name | Hit Name |
13 | H-Len | Total Length of Hit Sequence |
14 | H-Begin | Starting Position of Match in Hit |
15 | H-End | Ending Position of Match in Hit |
16 | H-Frame | Hit Frame |
17 | Description | Hit Description |
分析模块，引用了 ncbi-blast-2.2.31+ 软件（ftp://ftp.ncbi.nlm.nih.gov/blast/executables/blast+/2.2.31/）
相关文献如下所示：
Camacho, Christiam and Coulouris, George and Avagyan, Vahram and Ma, Ning and Papadopoulos, Jason and Bealer, Kevin and Madden, Thomas L (2009). BLAST+: architecture and applications. In BMC Bioinformatics, 10 (1), pp. 421.
