Interestingly, SAA antigen serum levels do not correlate to their respective anti-SAA or anti-SAA1α autoantibodies (S1 Fig), similarly to our previous study on a smaller number of HBDs [57], as well as a report on CRP and anti-CRP autoantibodies in a population of connective tissue and autoimmune diseases [63]. Here, SAA2 is linked to autoimmune disease.