CRP and rheumatoid arthritis: The largest group is Cluster 1 (red), containing 100 keywords, including alveolar macrophages, diseases, expression, dysfunction, rheumatoid-arthritis, tumor-associated macrophages, etc. Cluster 2 (green) follows, comprising 84 keywords, including adipose-tissue, endothelial dysfunction, insulin-resistance, oxidative stress, proteins, signaling pathways, etc. Cluster 3 (blue) has 77 keywords that include c-reactive protein, cholesterol, psoriasis, and so forth.