CCL13 and COVID-19: Additionally, the following association has been observed in SOTRs with COVID-19: adipocyte-derived cfDNA with TNF-α, IL-2, IL-6, IL-4, MIP-1α, and IL-5; vascular endothelium-derived specific cfDNA with IL-7, TARC, MCP-4; pancreas-derived cfDNA with Eotaxin-3, IL-7, IL-8, IL-15, IL-1β, and VEGF; and ddcfDNA with IL-8.