Dose–response curve of AG18 of adherent U937 on various ligand adsorbed surfaces cultured with 50 ng/ml PMA at 24 h. Adherent cell number decreased significantly (p<0.05 ANOVA) with increase of AG18 concentration from 0 to 20 μM and was comparable thereafter up to 80 μM. No significant difference was observed among various surfaces adsorbed with: ●, PBS; ▲, albumin; ■, fibronectin; × G6; *, G3RGDG; ◊, G3PHSRNG (n=2–4, error bars omitted for clarity).