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. 2018 Feb 7;8:2590. doi: 10.1038/s41598-018-20996-9

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© The Author(s) 2018

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A qPCR amplification curve comparing the responses of DNA amplified from black tar (BT-2 and BT-3) and white powder heroin (WP-2 and WP-3) using primer N263. Note the table in the upper left containing the cycle threshold values (Cp).