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Least square means of DNA extraction yields (ng/µL) from 250 mg fresh fecal samples and freeze-stored fecal samples (−20 °C and −80 °C with or without prior snap-freezing in liquid nitrogen). Polynominal contrasts: DNA extraction from fresh vs. frozen feces; p < 0.001; storage at −20 °C vs. −80 °C, p = 0.143; snap-freezing vs. none prior to freeze-storage, p = 0.761. Bars represent standard error of the mean, n = 6.
