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Convert GenBank format sequence into fasta format
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Usage
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gb2fasta [-h] [-c case] [-g] [-s] [-l dbPrefix] [dataFileName ...]

-h	This message.
-c	Specifiy the case of the output sequence, (upper, lower or original).
	Valid values: u, l, o. Default: o
-g	Suppress output of GI numbers.
-s	Simple fasta headers ID and DE only.
-l	Specifiy database label

Default input is from STDIN unless file names are specified. To explictly 
specify STDIN to be used for input use '-' as a filename.

For example:

Conversion to NCBI fasta format:

  > gb2fasta gbbct1.seq > gbbct1

Giving headers like:

  >gi|1418292|gb|X87617.1|A16SRRNA Actinomycete (genus unknown) 16S ribosomal RNA.

With GI numbers suppressed gives standard gb2fasta format:

  > gb2fasta -g gbbct1.seq > gbbct1

Giving headers like:

  >gb|X87617|A16SRRNA Actinomycete (genus unknown) 16S ribosomal RNA.

Conversion to a simple fasta format:

  > gb2fasta -s gbbct1.seq > gbbct1

Giving headers like:

  >A16SRRNA Actinomycete (genus unknown) 16S ribosomal RNA.

Specifing a different label, overrides the default 'gb' database label:

  > gb2fasta -l genbank  gbbct1.seq > gbbct1

Giving headers like:

  >gi|1418292|genbank|X87617.1|A16SRRNA Actinomycete (genus unknown) 16S ribosomal RNA.

If a label is specified it will be used for all input sequences.
Source: README.gb2fasta, updated 2014-05-11