polymerase chain reaction (Other Keyword)
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DNA Identification of Prehistoric Puebloan Quids (2015)
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Quids are small wads of fiber that were chewed or sucked by prehistoric Native Americans and then spit out. To identify the plants used for making a selection of quids from Antelope Cave, we extracted DNA from 10 quids, used polymerase chain reaction to amplify a 250-base section near the chloroplast trnL gene, and determined the sequence of the amplified fragment. DNAs from the 10 quids had identical base sequences, and these matched corresponding sequences from authentic samples of Yucca ...