| 435 / | HD | CHEMISTRY: MOLECULAR BIOLOGY AND MICROBIOLOGY |
| 440 | DF | PROCESS OF MUTATION, CELL FUSION, OR GENETIC MODIFICATION {6} |
| 441 | DF | .~ Mutation employing a chemical mutagenic agent {4} |
| 445 | ![]() | .~.~ By use of oxidative deamination agent (e.g., nitrous acid, etc.) |