Members of the respective GT family are listed below with corresponding annotation information. For detailed design information for expression constructs click the gene symbol to go the respective gene record. For general information on this enzyme family please see the CAZy site HERE.
| Gene Symbol | Uniprot | GeneID | UniProt Annotation |
| EXT1 | Q16394 | 2131 | Exostosin-1 (two GT domain protein with 2nd GT domain in GT64) |
| EXT2 | Q93063 | 2132 | Exostosin-2 (two GT domain protein with 2nd GT domain in GT64) |
| EXTL1 | Q92935 | 2134 | Exostosin-like 1 (two GT domain protein with 2nd GT domain in GT64) |
| EXTL3 | O43909 | 2137 | Exostosin-like 3 (two GT domain protein with 2nd GT domain in GT64) |