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Physiology
The epithelial cells of the villi in the small intestine are responsible for the final stage of digestion and nutrient absorption, playing a crucial role in the digestive process.
General Microbiology
Salmonella species, excluding Shigella sonnei, which is lactose non-fermenting, will ferment lactose in MacConkey agar, turning the colonies pink due to the formation of acidic end-products