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Extracellular matrix mineralization. Calcium deposit quantification of Saos-2 cells grown on glass coverslips or Pd-coated PU foams surfaces under standard conditions (SC) or electrical stimulation (ES) at 7, 14 and 21 days of culture. Different superscripts on top of the columns denote significant differences (p < 0.05) among different time-points of cells grown on the same materials and under the same conditions.
