As shown in Figure 2c, BAFF secretion was increased in response to either OA or RA MPs after 72 hours and reached 320 ± 76 pg/mL in response to RA MPs and 250 ± 34 pg/mL in response to OA MPs as compared with control medium (30 ± 9 pg/mL) and control supernatants (70 ± 12 and 50 ± 21 pg/mL, respectively). Here, TNFSF13B is linked to rheumatoid arthritis.