Effect of CD44 blocking on the adhesion of AGS (A,C) and MKN45 (B,D) presented as number of adherent cells (A,B) and visualized by immunohistochemistry (green for CD44, red for actin and blue for nuclei). The results were obtained for cell cultured during 78 h. Bars correspond to 50 µm. IgG was used as an isotype control. Significant differences (Kruskal-Wallis, Mann-Whitney test, p < 0.001) are marked with ***. Images for the control substrates (TCPS and TCPS-PLL) are presented in Supplementary Fig. S4.