Absorption of one of the following can occur without being broken down
Absorption of undigested protein can occur, especially in infants. This decreases with age. However, adults can still absorb undigested protein. The M cells (microfold cells) overlying the Payer's patches absorb antigens.
Protein
Triglycerides, although this seen only in infants
a-Dextrins
Sucrose
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