- AUT
AUTHOR one record for each author name (last name only, no initials)
- BIB
BIBLIO one record for each reference
- ACC
ACCESS one record for each accession number
- SMJ
SMJYT one record for each status, molecule, journal, year, type,
organelle, division, and db structure information
- SUB
SUBSEQ one record for each parent or sub-sequence
- LOC
LOCUS one record for each parent sequence
- KEY
KEYWORDS one record for each keyword
- SPEC
SPECIES one record for each taxon
- SHRT
SHORTL mostly, one record for each element of a short list
- LNG
LONGL one record for each group of SUBINLNG elements of a long list
- EXT
EXTRACT (for nucleotide databases only) one record for each exon of each subsequence
- TXT
TEXT one lrtxt-character record for each label of a species, keyword, or SMJYT