Table 1. Human PQ-loop proteins.
| UniProt ID | Swiss-Prot ID | Protein | Gene name | Length |
| P24390 | ERD21_HUMAN | ER lumen protein retaining receptor 1 (KDEL receptor 1) | KDELR1 | 212 |
| P33947 | ERD22_HUMAN | ER lumen protein retaining receptor 2 (KDEL receptor 2) | KDELR2 | 212 |
| O43731 | ERD23_HUMAN | ER lumen protein retaining receptor 3 (KDEL receptor 3) | KDELR3 | 214 |
| O60931 | CTNS_HUMAN | Cystinosin | CTNS | 367 |
| O75352 | MPU1_HUMAN | Mannose-P-dolichol utilization defect 1 protein | MPDU1 | 247 |
| Q9BRV3 | SWET1 _HUMAN | Sugar transporter SWEET1, RAG1-activating protein 1 (Stromal cell protein) | SLC50A1 RAG1AP1 | 221 |
| O96005 | CLPT1_HUMAN | Cleft lip and palate transmembrane protein 1 | CLPTM1 | 669 |
| Q96KA5 | CLP1L_HUMAN | Cleft lip and palate transmembrane protein 1-like protein (Cisplatin resistance-related protein 9) | CLPTM1L | 538 |
| Q2T9K0 | TMM44_HUMAN | Transmembrane protein 44 | TMEM44 | 475 |
| Q8N2U9 | PQLC1_HUMAN | PQ-loop repeat-containing protein 1 | PQLC1 | 271 |
| Q6ZP29 | PQLC2_HUMAN | PQ-loop repeat-containing protein 2 | PQLC2 | 291 |
| Q8N755 | PQLC3_HUMAN | PQ-loop repeat-containing protein 3 | PQLC3 | 202 |
| O95563* | BR44_HUMAN | Brain protein 44 protein | BRP44 | 127 |
| Q9Y5U8* | BR44L_HUMAN | Brain protein 44-like protein | BRP44L | 109 |
| A1A4F0* | CC055_HUMAN | Putative uncharacterized protein C3orf55 | C3orf55 | 135 |
*Short sequences homologous to both N- and C-terminal part of the other proteins in the table.