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RANKL/OPG ratios of PPF, SF, and DF are presented. a PPF monolayer culture (PPF) and PPF transwell culture (PPF TW) on day 10 (d10) and day 21 (d21). b SF monolayer culture (SF) and SF transwell culture (SF TW) on day 10 (d10) and day 21 (d21). c DF in DF monolayer culture (DF) and DF transwell culture (DF TW) on day 10 (d10) and day 21 (d21). P values are indicated ** = <0.01
