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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
IGHR1 IGHR1*01 F Re20 CH1 M29672 [1] c(s)
CH2 (including CHS) M29672 [1] c(s)
IGHM1 IGHM1*01 F Re4b CH1 M29679 [1] c(s)
CH2 M29679 [1] c(s)
CH3 M29679 [1] c(s)
CH4 (including CHS) M29679 [1] c(s)
IGHM2 IGHM2*01 F Re107 CH1 (1) M29676 [1]
CH2 (1) M29674 [1]
CH3
CH4 (including CHS)
IGHM5 IGHM5*01 F CH1
CH2
Re113 CH3 (1) M29675 [1]
CH4 (including CHS)
IGHM6 IGHM6*01 F CH1
CH2
CH3
Re02741 CH4 (including CHS) (1) M29677 [1]
M1 (1) M29678 [1]
M2 M29678 [1]

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

IMGT notes:
  1. (1) Partial in 5'.
IMGT references:
  1. [1] Harding F.A. et al., Nucleic Acids Res., 18, 6369-6376 (1990). PMID: 2123029
See also (IMGT Scientific chart):