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900x900pxgut flora illustration, gastrointestinal bacteria, large intestine microbiota, prebiotic benefits, digestive health diagram, intestinal flora analysis, human microbiome research
1220x1263pximmune system response, virus and bacteria interaction, antibody production, protein structure in immune defense, pathogen visualization, cellular immunity, microorganism illustration
1024x1024pxpathogenic bacteria, green microorganism design, virus prevention artwork, mold on leaf, infectious agent illustration, pathogen outbreak graphic, microbial infection symbol
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618x800pxgastrointestinal tract illustration, gut microbiota diversity, small intestine bacteria, large intestine flora, digestive health benefits, intestinal microbe ecosystem, probiotic gut support
900x576pxprokaryotic bacteria structure, nucleoid in bacterial cell, flagellum function in prokaryotes, cytoplasm composition of prokaryotes, microbiology cell diagram, simple bacterial cell illustration, visual bacterial cell components