DEFINITION

DEFINITION      - A concise description of the sequence. Mandatory
keyword/one or more records.

DEFINITION format
  The DEFINITION record gives a brief description of the sequence,
proceeding from general to specific. It starts with the common name of
the source organism, then gives the criteria by which this sequence is
distinguished from the remainder of the source genome, such as the
gene name and what it codes for, or the protein name and mRNA, or some
description of the sequence's function (if the sequence is
non-coding). If the sequence has a coding region, the description may
be followed by a completeness qualifier, such as cds (complete coding
sequence). There is no limit on the number of lines that may be part
of the DEFINITION.  The last line must end with a period.

DEFINITION Format for NLM Entries
  The DEFINITION line for entries derived from journal-scanning at the NLM is
an automatically generated descriptive summary that accompanies each DNA and
protein sequence. It contains information derived from fields in a database
that summarize the most important attributes of the sequence.  The DEFINITION
lines are designed to supplement the accession number and the sequence itself
as a means of uniquely and completely specifying DNA and protein sequences. The
following are examples of NLM DEFINITION lines:

NADP-specific isocitrate dehydrogenase [swine, mRNA, 1 gene, 1585 nt]

94 kda fiber cell beaded-filament structural protein [rats, lens, mRNA
Partial, 1 gene, 1873 nt]

inhibin alpha {promoter and exons} [mice, Genomic, 1 gene, 1102 nt, segment
1 of 2]

cefEF, cefG=acetyl coenzyme A:deacetylcephalosporin C o-acetyltransferase
[Acremonium chrysogenum, Genomic, 2 genes, 2639 nt]

myogenic factor 3, qmf3=helix-loop-helix protein [Japanese quails,
embryo, Peptide Partial, 246 aa]

  The first part of the definition line contains information describing
the genes and proteins represented by the molecular sequences.  This can
be gene locus names, protein names and descriptions that replace or augment
actual names.  Gene and gene product are linked by "=".  Any special
identifying terms are presented within brackets, such as: {promoter},
{N-terminal}, {EC 2.13.2.4}, {alternatively spliced}, or {3' region}.

  The second part of the definition line is delimited by square brackets, '[]',
and provides details about the molecule type and length.  The biological
source, i.e., genus and species or common name as cited by the author.
Developmental stage, tissue type and strain are included if available.
The molecule types include: Genomic, mRNA, Peptide. and Other Genomic
Material. Genomic molecules are assumed to be partial sequence unless
"Complete" is specified, whereas mRNA and peptide molecules are assumed
to be complete unless "Partial" is noted.