| Code | Name | ID | MW | PDB ID | Crystallographer | Purification |
|---|---|---|---|---|---|---|
| UTP | IDP98475 | 24,459.07 kDa | 7RH8 | Peter Stogios | Tatiana Skarina (UT) | |
| URI | uridine | IDP04297 | 31,939.21 kDa | 4EG2 | George Minasov | Tatiana Skarina (UT) |
| URE | urea | IDP07164 | 32,137.72 kDa | 6NFP | George Minasov | Elena Evdokimova (UT) |
| URA | uracil | IDP00044 | 63,625.42 kDa | 3SLF | Maks Chruszcz | Elena Evdokimova (UT) |
| UNX | Unknown atom | IDP95820 | 65,651.83 kDa | 6CI6 | Barat Venkataramany | Katarzyna Handing (UVA) |
| UNX | Unknown atom | IDP90557 | 26,043.81 kDa | 3RSH | Jing Hou | Jing Hou (UVA) |
| UNX | Unknown atom | IDP52003 | 35,615.41 kDa | 7KRX | Jerzy Osipiuk | Christine Tesar (ANL) |
| UNX | Unknown atom | IDP52003 | 35,615.41 kDa | 7KOJ | Jerzy Osipiuk | Christine Tesar (ANL) |
| UNX | Unknown atom | IDP90557 | 26,043.81 kDa | 3U09 | Jing Hou | Jing Hou (UVA) |
| UNX | Unknown atom | IDP90557 | 26,043.81 kDa | 3TZH | Jing Hou | Jing Hou (UVA) |
| UNX | Unknown atom | IDP97426 | 40,824.82 kDa | 6U8J | Karolina Michalska | Elena Evdokimova (UT) |
| UNX | Unknown atom | IDP95820 | 65,651.83 kDa | 6U4R | Mateusz Czub | Katarzyna Handing (UVA) |
| UNX | Unknown atom | IDP90557 | 26,043.81 kDa | 3TZK | Jing Hou | Jing Hou (UVA) |
| UNX | Unknown atom | IDP00167 | 483,499.45 kDa | 3FZY | Ludmilla Shuvalova | James Winsor (NU) |
| UNX | Unknown atom | IDP95820 | 65,651.83 kDa | 6U5A | Mateusz Czub | Katarzyna Handing (UVA) |
| UNX | Unknown atom | IDP52003 | 35,615.41 kDa | 7KOK | Jerzy Osipiuk | Christine Tesar (ANL) |
| UNX | Unknown atom | IDP52183 | 21,781.93 kDa | 7KYJ | Mateusz Czub | Karolina Majorek (UVA) |
| UNX | Unknown atom | IDP95820 | 65,651.83 kDa | 6U4X | Mateusz Czub | Katarzyna Handing (UVA) |
| UNX | Unknown atom | IDP52003 | 35,615.41 kDa | 7JN2 | Jerzy Osipiuk | Christine Tesar (ANL) |
| UNM | 7-[(cis-4-aminocyclohexyl)amino]-5-bromo-1-benzofuran-2-carboxylic acid | IDP92102 | 48,316.22 kDa | 5E5I | Ekaterina Filippova | Kristin Flores (NU) |