COA4 and myocarditis: used their library with plasma from mice that had virus-induced myocarditis, which is a model system used to study the disease progression of myocarditis into dilated cardiomyopathy, and found autoantibodies to 32 peptides from 25 proteins not previously reported, most notably COA4, which was also found when screening the human peptidome against the same mouse sera (50).