Calcium phosphate resorbing activity of PBMC cultures. Cells cultures, maintained in base medium (BM, a) or supplemented with M‐CSF and RANKL (M+R, b), and co‐cultures of PBMC + hBMC cells (c), were performed in absence (control) or presence of 0.004 mg/ml Equisetum arvense extract. a – Representative images of calcium phosphate layers after cell removal. b – Quantification of resorbed areas expressed as percentage of total area. *Significantly different from control cultures.