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| Macrophage |
| | Large phagocytic cells of the blood or lymph systems that can engulf particles or small organisms. |
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| Mechanism of Action |
| | The specific manner by which a substance causes a particular effect. |
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| Metabolism |
| | The conversion of a chemical from one form to another. It is also known as biotransformation. |
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| Metabolite |
| | A chemical produced when a substance is metabolized by a biological organism. |
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| Mg/kg |
| | A commonly used dose that stands for mg of a substance per kg of body weight. |
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| Mg/kg/day |
| | A commonly used dosage that stands for mg of a substance per kg of body weight on a daily basis. |
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| Mg/M3 |
| | An exposure unit used to express concentrations of particulates in the air, standing for milligrams of compound per cubic meter of air. |
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| Microgram (µg) |
| | A commonly used unit of weight consisting of one millionth (1 x 10-6) of a gram. |
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| Microsomes |
| | The subcellular organelles that are a part of the smooth endoplasmic reticulum. |
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| Milligram (mg) |
| | The most commonly used unit of measure in medicine and toxicity consisting of one thousandth of a gram (1x10-3 g). |
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| Monooxygenase |
| | Enzyme system (such as cytochrome P450 ) involved in the oxidation of compounds. |
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