The formylpeptide receptors (nomenclature agreed by the NC-IUPHAR Subcommittee on the formylpeptide receptor family [196]) respond to exogenous ligands such as the bacterial product fMet-Leu-Phe (fMLP) and endogenous ligands such as lipoxin A4 (LXA4), 15-epi-lipoxin A4, annexin I , cathepsin G, amyloid β42, serum amyloid A and spinorphin, derived from β-haemoglobin. FPR1 also serves as a plague receptor for selective destruction of human immune cells by Y. pestis [135]. The FPR1/2 agonists 'compound 17b' and 'compound 43' have shown cardiac protective functions [149, 64].
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Bäck et al. (2021) studied this question.
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