LYZ and rheumatoid arthritis: Moreover, lysozyme levels were also found to be positively correlated with total IgG (r = 0.497, P = 0.0002 in RA subjects; r = 0.389, P = 0.0057 in healthy controls) and total IgA levels (r = 0.392, P = 0.0049 in RA subjects; r = 0.319, P = 0.025 in healthy controls) in both RA patients and healthy controls (Figures 5D,E).