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Functional Grade™ (FG™) Purified: Sodium azide-free, 0.22 um filtered, and endotoxin-tested < 0.001 ng/µg (unless otherwise noted).
Functional Grade™ (FG™) Biotin: Sodium azide-free, 0.22 um filtered, and endotoxin-tested < 0.05 ng/µg.
Purified: Contains sodium azide, 0.22 um filtered, and not endotoxin tested.
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