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(a) Correlation between fecal B cell activating factor (BAFF) in three random spot samples and a corresponding homogenized sample (n = 20). Pearson’s correlation varied between 0·86 and 0·95 (P < 0·0001). (b) Fecal BAFF concentrations before and after 7 days of storage at 20°C; Mann–Whitney U‐test for pairwise comparisons (P = 0·2604).
