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A hFXN-M from human heart left ventricle. B mFXN-M from Rhesus macaque heart left ventricle. C 50:50 mixture of hFXN-M and mFXN-M. The most intense MRM transitions for each peptide were used: SGTLGHPGSLDDTTYER (y142+), SGTLGHPGSLDETTYER (y142+), QIWLSSPSSGPKR (y8+), LGGDLGTYVINK (y10+), LDLSSLAYSGK (y10+), NWVYSHDGVSLHELLGAELTK (y193+), NWVYSHDGVSLHELLAAELTK (y193+).
