| 1XXA | A:; B:; C:; D:; E:; F: | C-TERMINAL DOMAIN OF ESCHERICHIA COLI ARGININE REPRESSOR/ L-ARGININE COMPLEX; PB DERIVATIVE |
| 1XXB | A:; E:; F:; B:; C:; D: | C-TERMINAL DOMAIN OF ESCHERICHIA COLI ARGININE REPRESSOR/ L-ARGININE COMPLEX |
| 1XXC | A:; B:; C:; D:; E:; F: | C-TERMINAL DOMAIN OF ESCHERICHIA COLI ARGININE REPRESSOR |