Production of BAFF (A), HGF (B), and OPN (C) in cultures of BMSCs of MM patients and control subjects and in co-cultures of both types of cells cultivated in cell-to-cell contact or in non-contact conditions, where the cells were separated by a transwell. The cytokine level was measured by ELISA in supernatants from the monocultures and co-cultures. *Significantly different from the control group, p<0.05; #significantly different from monoculture within the group, p<0.05.