SERPINB9 and rheumatoid arthritis: Two of the effectors of miR-29b-3p in our candidate genes, BDKRB2 and SERPINB9, were categorized into the molecular function of protease binding by gene ontology, as shown in Figure 2A and Table 6, which may support the involvement of miR-29b-3p in the regulation of bone matrix in RA.