Fig. (8) MTT activity by human monocytes after co-culture with Al-adjuvants. Normalized MTT activity ratio of human peripheral monocytes cultured in the presence of Alhydrogel^® (●) and Adju-Phos^® (■). The MTT assay was performed either 1 h (A) or 4 h (B) after addition of ABAs to the monocytes. Data presented as mean +/- SD from three independent donors.