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Function：
Cut out a designated section of a single sequence or multiple sequences.
Input：
Upload FASTA format sequences or paste the FASTA format sequences in the window.
Parameters：
①Single sequence interception: input sequence name, start site and end site.
②Multiple sequences interception: upload a txt format section file with three columns: sequence name, start site and end site.
③Extend to the left: number of extended characters from the start site to the left.
④Extend to the right: number of extended characters from the end site to the right.
Note: blank means interception of the full sequence.
Output：
Downloadable FASTA files of intercepted sequences.
Case presentation1：
Enter the following four sequences， set： Single segment pattern, set the name of the sequence to seq1, starting position is 3, the end position of 10, to a unit, so the starting position into 2
>seq1
TCATTTAATGAC
>seq2
ATGGC
>seq3
TCACATGATGCCG
>seq4
ATGGAAGC
The output of：
>seq1_2_10
CATTTAATG
Case presentation2：
Click on the item of tags b、Multiple sequences interception ，Under section file input sequence parameters, format as follows, the model for multiple segments
seq1 1 10
seq2
seq3 1 10
The output of：
>seq1_1_10 TCATTTAATG >seq2 ATGGC >seq3_1_10 TCACATGATG