Canis lupus familiaris [CDR1-IMGT.CDR2-IMGT.CDR3-IMGT]	lengths per IGHV subgroup.
| IGHV subgroups and genes | ||||
|---|---|---|---|---|
| Subgroup | [CDR-IMGT lengths] | Number of genes | ||
| F | ORF | in-frame P | ||
| IGHV1 | [8.8.2] | 1 | 0 | 1 | 
| IGHV3 | [8.8.1] | 6 | 0 | 1 | 
| [8.8.2] | 26 | 2 | 14 | |
| [8.8.3] | 1 | 0 | 1 | |
| IGHV4 | [9.5.2] | 1 | 0 | 0 |