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A cassette corresponds to the organization of small units at the genomic DNA level. Cassettes are found, for example, for chondrichthyes (shark, skate) Ig-Heavy (IGH) genes and for teleostei Ig-Light-Iota (IGI) genes.

Chondrichtyes IGH cassettes

Teleostei IGI cassettes

The 'cassette' concept is part of the 'CLASSIFICATION' concept of IMGT-ONTOLOGY[1]

[1] Giudicelli, V. and Lefranc, M.-P., Bioinformatics, 15, 1047-1054 (1999) PMID: 10745995, LIGM:221 pdf PMID: 9783210