In the context of beneficial activity of immune modulators applied clinically in sepsis, such as Vitamin D (158) and more recently omega-3 fatty acid preparations (159), parallel measurements of, e.g., C3 and LL-37, produced by cells, which express Vitamin D receptor (VDR) and ω-3 fatty acid receptor (GPR120), would provide the type of comparative analyses needed to direct this overlapping field. Here, FFAR4 is linked to Sepsis.