| 1A95 | A:; B:; C:; D: | XPRTASE FROM E. COLI COMPLEXED WITH MG:CPRPP AND GUANINE |
| 1A96 | A:; B:; C:; D: | XPRTASE FROM E. COLI WITH BOUND CPRPP AND XANTHINE |
| 1A97 | A:; B:; C:; D: | XPRTASE FROM E. COLI COMPLEXED WITH GMP |
| 1A98 | A:; B: | XPRTASE FROM E. COLI COMPLEXED WITH GMP |
| 1NUL | A:; B: | XPRTASE FROM E. COLI |