The U. S. Food and Drug Administration ( FDA ) recommends freezing at − 35 ° C (− 31 ° F ) for 15 hours, or at − 20 ° C (− 4 ° F ) for 7 days.

The U. S. Food and Drug Administration ( FDA ) regulations establish limits for contaminants in bottled water that must provide the same protection for public health.

The U. S. Food and Drug Administration ( FDA ) regulates these devices, whereas the Gamma Knife is regulated by the Nuclear Regulatory Commission.

The U. S. Food and Drug Administration ( FDA ) recommends freezing at-35 ° C (- 31 ° F ) for 15 hours, or at-20 ° C (- 4 ° F ) for 7 days.

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