Figure 2.

Peptide and amino acid transport systems in the intestine. The EAAT3 transporter is an important transporter for anionic amino acids. The Na⁺-coupled transporter B⁰AT₁ is the major transporter for neutral amino acids. Additionally, b^0,+AT transporter are located at the luminal membrane as the major transport system for cationic amino acids. Majorly acid antiporters such as LAT2 and y⁺LAT1 are expressed at the basolateral membrane, enabling a physiologically important amino acid replacement. PepT1 is an important transporter for intact peptides, which are not degraded into amino acids. Modified from Poncet and Taylor [46].