Fig. 1.

Blastocystis ST4 colonization did not induce any abnormal effects on normal healthy mice. a Experimental design. b Weight changes and disease activity index (DAI) between control and ST4-colonized mice. c Blastocystis ST4 cells per milligram of stool in ST4-clonized mice. d Scanning electron microscopy (SEM) of colonic and cecum tissues from control and ST4-clonized mice, Blastocystis are indicated with red asterisk (*). Scale bar = 1 μm. e Colon length at endpoint. f Representative micrographs of H&E-stained colon sections from control and ST4-colonized mice, and colonic histological scores at day 7. Scale bar = 100 μm