In the cases of dilated cardiomyopathy, cardiac muscle contraction, and hypertrophic cardiomyopathy (B), seven downregulated proteins were enriched, including Myl2, Myl3, Myh7, Atp2a1, Tpm1, Tpm2, and Ttn (Figure 10). Here, ATP2A1 is linked to dilated cardiomyopathy.