Variation in base-substitution mutation in experimental and natural lineages of Caenorhabditis nematodes.

briggsae AF16 ↔ HK104), Ts/Tv had a narrower range from 1.01 to 1.42 though the variation was highly significant ( P = 3.3 × 10 − 24 , X 2 test), primarily due to the unusually low ratio in the N2 ↔ CB4856 SNPs.

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Pooling autosomal mutations to compare against X mutations revealed a marginally significant difference in the autosomal versus X rate in PB306 ( P = 0.04, X 2 test) but not in the other three MA lines sets (0.30 < P < 0.86, X 2 tests).

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