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How to extract the peptide sequence centered the amino acid position of protein?

Hi, can any tools be able to extract the peptide sequence, in a certain length, centered the amino acid position of protein?

Thanks.

peptide sequence;amino acid position

The question as you've stated it isn't clear to me. Can you please provide a simple example to illustrate it further?

Yes, I have the chromosome and the protein position information like: chr1 230

What I want to extract is the amino acid sequence centered the chr1:230 position, with one length parameter offered L. So the actual peptide sequence is the 230-L to 230+L region on chr1.

If there is any program would automatically extract these information in batch should be convenient.

I've solved this problem.

Congrats. Can you explain the solution as this task might be important for others? Thanks

@Lisa Can you provide your solution to the rest of us? Thanks.

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