| 1 | A large number of hydrocarbons such as benzopyrene are also mutagenic. | |
| 2 | The first chemical mutagens to be discovered were the mustard gases used in World War I. | |
| 3 | All test results are negative. Zhijiangmycin was non inducer in this condition. | |
| 4 | At the same time, the mutative effects of all mutative factors in the experiment were evaluated and compared with each other, too. | |
| 5 | The analysis of Sister Chromatid Exchanges (SCE)frequencies is a useful tool for the study of damages in genetic material of human beings induced by environmental mutagens and carcinogens. |