The marker pair on chromosomes 1p and 2q, which gave a Z score of -4.08 in Mexicans, also had a nominally significant Z score in Puerto Ricans (-2.40), while the pair on chromosomes 1p and 17p (Z score of -4.09 in Mexicans) also had a nominally significant Z score in Puerto Ricans, but in the opposite direction (Z = +2.42).
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The sentences
We observed a highly significant regression coefficient for the European-Native American δ (0.0339 ± 0.0037), while neither of the other coefficients was statistically significant, nor was the intercept significantly different from 1.