The action of titanium on guinea pig macrophages and human lymphocytes cultured in vitro is studied with the fluorochromasia test and with the extent of blast transformation and mitoses. No differences between the percentages of macrophages which show fluorochromasia are observed in cultures with titanium and in untreated control cultures. Titanium doesn't exert negative influence on reduplication of human lymphocytes cultured in vitro with phytohemoagglutinine (P.H.A.).
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