Natural product-based therapy for inflammation and arthritis: Quercetin increases IL-9 levels, augments proliferation of ILC2s (type 2 innate lymphoid cells) and regulatory T (Treg) cells, promotes resolution of inflammation, attenuates cartilage destruction, decreases bone loss, and inhibits pathological features associated with arthritis via up-regulation of its target genes, 7/April/2018, 10.43 pm