- G unit: equals 1 g of the crystalline material or about 1,000,000 S units;
- L unit: equal to 1000 S units;
- S unit: the amount of streptomycin that will inhibit the growth of a standard strain of Escherichia coli in 1 mL of nutrient broth or other suitable medium.
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Examples: glitazone, GI cocktail, etc.