| 21. | Since 1996, a level superior to two nanograms in urine tests has been proscribed.
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| 22. | The established limit is 2 nanograms per milliliter
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| 23. | The limit is 2 nanograms per milliliter.
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| 24. | Moul believes black men with PSA readings of 2 or more nanograms should get a biopsy.
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| 25. | But at that time his PSA was slightly elevated at 5.5 nanograms per milliliter.
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| 26. | Their weight was measured in " nanograms, " or billionths of a gram.
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| 27. | The sensors can register as little as a nanogram, or one billionth of a gram.
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| 28. | The rules allow 15 nanograms per milliliter in testing for marijuana; the IOC allows none.
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| 29. | The limit is 2 nanograms per milliliter
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| 30. | The limit of detection of melamine is a few nanograms of melamine per gram of milk.
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