| 1 | Germans introduced mustard gas which interfered with the Allied artillery. | |
| 2 | The first chemical mutagens to be discovered were the mustard gases used in World War I. | |
| 3 | Some pepper compounds, shoyu , ready-mix spices, some seasoning powders, certain brands of mustard. | |
| 4 | Some areas should be kept secure as a failsafe because mustard gas can be very persistent in the environment, he warned. | |
| 5 | Among the threats the United States is focusing on is Libya' s stockpile of deadly mustard gas, he said. |
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