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  • Laboratory hoods designed to be used to prepare for and/or to perform polymerase chain reaction (PCR) amplification procedures with a reduced risk of contamination. These hoods usually consist of a nonventilated plastic (e.g., acrylic) enclosure with transparent windows, providing a dead air space in which the PCR procedures are performed, and ultraviolet lamps to irradiate the hood, as well as fluorescent working lights, timers, and doors (e.g., hinged sash) for the manipulation of samples, testing devices, and reagents. PCR hoods are intended to prevent product contamination during procedures, but they do not provide protection to the user. PCR hoods are not biological safety enclosures and should not be used when infectious and/or potentially infectious materials are handled; some PCR hoods may provide appropriate shielding for radioactive substances used in the radioactive labeling of DNA.
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