| PF00129 | Class I Histocompatibility antigen, domains alpha 1 and 2 (MHC_I) | Class I Histocompatibility antigen, domains alpha 1 and 2 | - | Domain |
| PF07654 | Immunoglobulin C1-set domain (C1-set) | Immunoglobulin C1-set domain | - | Domain |
| PF07654 | Immunoglobulin C1-set domain (C1-set) | Immunoglobulin C1-set domain | - | Domain |
| PF07686 | Immunoglobulin V-set domain (V-set) | Immunoglobulin V-set domain | This domain is found in antibodies as well as neural protein P0 and CTL4 amongst others. | Domain |
| PF09291 | Domain of unknown function (DUF1968) (DUF1968) | Domain of unknown function (DUF1968) | Members of this family are found in mammalian T-cell antigen receptor, and adopt an immunoglobulin-like beta-sandwich fold, with seven strands in two beta-sheets in a Greek-key topology. Their exact function has not, as yet, been determined. | Domain |