CCL13 and obstructive sleep apnea syndrome: However, we found that Macrophage inflammatory protein 1a levels, C-C motif chemokine 28 levels, fms-related tyrosine kinase 3, Monocyte chemoattractant protein-3 levels, Adenosine deaminase levels, Fibroblast growth factor 19 levels, Monocyte chemoattractant protein-4 levels, Fractalkine levels, and STAM binding protein levels may have a reverse causal relationship with OSA (Table 2).