cytokine secretion trait interleukin secretion trait Any measurable or observable characteristic related to the controlled release of soluble factors which stimulate growth-related activities of leukocytes and other cell types, that can act to enhance cell proliferation and differentiation, DNA synthesis, secretion of other biologically active molecules and responses to immune and inflammatory stimuli. EFO:0801722 EFO:0801726 EFO:0801728 EFO:0801764 Trait.ontology VT:0008568