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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

thing go
a separate and self-contained entity

unit, building block go
a single undivided natural thing occurring in the composition of something else

molecule go
(physics and chemistry) the simplest structural unit of an element or compound

macromolecule, supermolecule go
any very large complex molecule

protein go
any of a large group of nitrogenous organic compounds that are essential constituents of living cells

cytokine
any of various protein molecules secreted by cells of the immune system that serve to regulate the immune system

noun.substance

2 Subcategories

tumor necrosis factor, tumour necrosis factor, TNF go
a proinflammatory cytokine that is produced by white blood cells (monocytes and macrophages)
lymphokine go
a cytokine secreted by helper T cells in response to stimulation by antigens and that acts on other cells of the immune system (as by activating macrophages)