TLR4 and myocarditis: Immunostaining for TLR4 showed an overexpression of TLR4 in PS patients vs. no-PS myocarditis and vs. controls (3.44 ± 0.51 vs. 1.56 ± 0.2 and 3.44 ± 0.51 vs. 0.18 ± 0.17).