CD79A and in situ carcinoma: Although no statistically significant associations were observed, a trend for two negative correlations was noted between serum levels of propionate and the proportion of IgA+ PBs (p=0.08; Figures 3A, B) as well as butyrate and the proportion of IgA+ Tbet+/CD21low MBCs (p=0.12; Figures 3A, C) in CIS/MS patients.