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Immunoblots showing HSP72 levels in HT29 cells after a 24 h exposure to the different sludge extracts at different concentrations. Cells were subjected to soluble sludge extracts alone (SE), to soluble sludge extracts + heavy metal solution (SE + HM), or to heavy metal solution alone (HM) at the indicated concentrations expressed as grams per kilogram of dry material. Untreated cells are control (C) S1, S2, S3, different sludge [102].
