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=item format

Specify the format of the file.  Supported formats include fasta,
genbank, embl, swiss (SwissProt), Entrez Gene and tracefile formats
such as abi (ABI) and scf. There are many more, for a complete listing
see the SeqIO HOWTO (L<http://bioperl.open-bio.org/wiki/HOWTO:SeqIO>).

If no format is specified and a filename is given then the module will
attempt to deduce the format from the filename suffix. If there is no
suffix that Bioperl understands then it will attempt to guess the
format based on file content. If this is unsuccessful then SeqIO will 
throw a fatal error.

The format name is case-insensitive: 'FASTA', 'Fasta' and 'fasta' are
all valid.

Currently, the tracefile formats (except for SCF) require installation
of the external Staden "io_lib" package, as well as the
Bio::SeqIO::staden::read package available from the bioperl-ext
repository.