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"+" or "-" indicates if the gene sequences have been found (+) or not been found (-) transcribed (T) and/or translated into protein (Pr). Arbitrarily that information is shown on the first line of each gene when the data have been confirmed by several studies.

Functionality is shown between parentheses, (F) and (P), when the accession number refers to rearranged genomic DNA or cDNA and the corresponding germline gene has not yet been isolated.
Functionality is shown between brackets, [F] and [P], when the accession number refers to genomic DNA, but not known as being germline or rearranged.

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M1 and M2 exons are not shown if not yet isolated.

IMGT gene name IMGT allele name Fct T Pr Positions in the locus IMGT/LIGM-DB reference sequences IMGT/LIGM-DB sequences from the literature
Strain Clone names Exons Accession numbers Positions in the sequence Secondary accession numbers Strain Clone names Accession numbers Positions in the sequence
IGHM1 IGHM1*01 CH1
CH2
CH3
CH4
M1
M2
IGHR1 IGHR1*01 F 2113 CH1 U08009 [1]
CH2 U08009 [1]
CHS U08009 [1]
IGHR2 IGHR2*01 F VCC2 CH1 U08010 [1] c (s)
CH2 U08010 [1] c (s)
IGHR3 IGHR3*01 P (1) DD2 CH1 U08011 [1] c
CH2
IGHR4 IGHR4*01 F X101 CH1 U08012 [1] c
CH2

c: cDNA sequence.
(s): transcript of secreted chain.

IMGT notes:
  1. (1) Frameshift in the C-REGION.
IMGT references:
  1. [1] Anderson M. et al., Int. Immunology, 6, 1661-1670 (1994). PMID: 7865459
See also (IMGT Scientific chart):