The EMBL format is widely used to represent annotated nucleotidic sequences.
It contains several keys and subkeys to describe sequence characteristic.
Each sequence starts by the key ID and terminates by //. The record
can contain more than one sequence. 

Example: 

ID   M28276; SV 1; linear; mRNA; STD; VRT; 297 BP.
XX
AC   M28276;
XX
DT   02-FEB-1990 (Rel. 22, Created)
DT   17-APR-2005 (Rel. 83, Last updated, Version 3)
XX
DE   Frog albumin mRNA, partial cds.
XX
KW   albumin.
XX
OS   Xenopus laevis (African clawed frog)
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Amphibia;
OC   Batrachia; Anura; Mesobatrachia; Pipoidea; Pipidae; Xenopodinae; Xenopus;
OC   Xenopus.
XX
RN   [1]
RP   1-297
RX   PUBMED; 3971963.
RA   Wolffe A.P., Glover J.F., Martin S.C., Tenniswood M.P.R., Williams J.L.,
RA   Tata J.R.;
RT   "Deinduction of transcription of Xenopus 74-kDa albumin genes and
RT   destabilization of mRNA by estrogen in vivo and in hepatocyte cultures";
RL   Eur. J. Biochem. 146(3):489-496(1985).
XX
FH   Key             Location/Qualifiers
FH
FT   source          1..297
FT                   /organism="Xenopus laevis"
FT                   /mol_type="mRNA"
FT                   /tissue_type="liver"
FT                   /db_xref="taxon:8355"
FT   CDS             <1..>297
FT                   /codon_start=1
FT                   /gene="albumin"
FT                   /product="albumin"
FT                   /db_xref="GOA:P14872"
FT                   /db_xref="UniProtKB/Swiss-Prot:P14872"
FT                   /protein_id="AAA49642.1"
FT                   /translation="HCCAVPENQRMPCAEGDLTILIGKMCERQKKTFINNHVAHCCTDL
FT                   YSGMRSCFTALGPDEDYVPPPVTDDTFDFDDKICTANDKEKQHIKQKFLVKLIK"
XX
SQ   Sequence 297 BP; 98 A; 61 C; 59 G; 79 T; 0 other;
     cactgctgtg ccgtacctga aaatcaaagg atgccatgtg cagaaggaga ccttaccatt        60
     ctcattggaa aaatgtgtga aaggcaaaag aagacattta taaataacca cgttgctcat       120
     tgctgcactg acttatattc tgggatgcgt tcatgcttta ctgctcttgg tccagatgag       180
     gactatgtac cacccccagt tactgatgac acatttgact ttgacgacaa gatatgcact       240
     gctaatgata aagaaaaaca gcatatcaaa cagaaattcc ttgtgaagct gattaaa          297
//