Structure type
The 'structure type' concept identifies sequences that show a classical organization (regular), from those which have been modified either naturally (processed, translocated, transposed,..), or artificially (transgene, humanized, engineered, etc).
The structure types can be queried by clicking on "Structure" in the "Taxonomy,..." module in IMGT/LIGM-DB.
The 'structure type' concept is part of the 'IDENTIFICATION' concept of IMGT-ONTOLOGY[1]
Reference:
[1] Giudicelli, V. and Lefranc, M.-P., Bioinformatics, 15, 1047-1054 (1999)
PMID:10745995,
LIGM:221 
See also: