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Exposure of RPMI 8226, Karpas 707 and U266 human myeloma-like lines to low doses of As 2 O 3 was followed by a marked increase in lymphokine activated killers (LAK)-mediated killing and up- modulation of CD38 and CD54, two molecules involved in cell-cell interactions. Moreover, simultaneous exposure of effectors and targets to As 2 O 3 yielded the most effective condition...
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