The polymorphism concerns
- the sequence polymorphisms described at the nucleotide level and
- the Restriction Fragment Length Polymorphisms (RFLP) detected by Southern hybridization.
IMGT sequence polymorphisms
IMGT sequence polymorphisms of the coding region of the Ig and TcR genes are described in Alignments of alleles  and Tables of alleles [2-6] (IMGT Repertoire). Their description is according to the IMGT allele nomenclature for sequence polymorphisms which has been set up for Ig and TcR of human and other vertebrates (IMGT Scientific chart). The allele polymorphism mutations are described according to the IMGT description of mutations.
IMGT RFLP polymorphisms
IMGT RFLP polymorphisms are described in the section "Probes and RFLP" of the IMGT Repertoire.