Full-size image (21 K) Fig. 2. Concentrations of intact <a href="http://www.mhc-class-ii-antigen.com/the-human-colon-adenocarcinoma-cell-line-caco-was.html">IGF 1 LR3</a> in the apical solutions after 60 min of incubation with the Caco-2 monolayer. The initial peptide concentration was 400 μg/ml, an