CD80 and rheumatoid arthritis: Comparison between untreated and LPS‐treated groups showed that CD80 expression was significantly lower in probiotic groups of HC (pDel vs. LPS = 0.0014, pMix vs. LPS = 0.0006, and pRam vs. LPS = 0.0094) and RA patients (pDel vs. LPS = 0.0324, pRam vs. LPS = 0.0011, and pMix vs. LPS = 0.0100).