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Sum probability distributions of directly dated maize from sites and regions of interest alongside the 2σ-calibrated ranges of the earliest regional microbotanical dates (55). Nucleotide variability data are provided for the earliest cobs from the Tehuacan Valley (tga1, tb1, su1, and bt2) (24, 25) and Ocampo caves (tb1, pdf, and su1) (30).
