abnormal circulating interleukin-17 level increased circulating interleukin-17 level MP:0008614 MPheno.ontology Several subtypes of interleukin-17 have been identified, each of which is a product of a unique gene. increase in the amount in the blood of a proinflammatory cytokine produced primarily by T-cells or their precursors increased circulating CTLA-8 level increased circulating CTLA8 level increased circulating IL-17 level increased circulating IL17 level increased circulating ML-1 level increased circulating cytokine CX2 level increased circulating cytotoxic T lymphocyte-associated antigen 8 level