Barely Significant

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On the genus level, the lower abundance was observed primarily in Alistipes (100%—three non-RCTs [ 30 , 43 , 49 ]), while a weak trend for higher abundance was observed in Bacteroides (50%—one RCT [ 8 ] and four non-RCTs [ 31 , 46 , 48 , 52 ], with the last one observed only in B. coprococcus and B. vulgaris and one elevated only in B.fragilis vs. 50%—five non-RCTs [ 29 , 30 , 36 , 49 , 52 ], with the last one observed only in B. fragilis ).
As depicted in Figure 2 b, MP and DEE significantly decreased Type I Collagen levels compared to unexposed tissues already after 1 day of exposure, whereas skin biopsies exposed to the other pollutants did not display any relevant changes although O 3 and CS showed a trend in the decrease of collagen protein levels.