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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

plasma protein go
any of the proteins in blood plasma

gamma globulin, human gamma globulin go
a plasma protein containing the immunoglobulins that are responsible for immune responses

immunoglobulin, Ig, immune serum globulin, immune gamma globulin, immune globulin go
a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response

immunoglobulin G, IgG
one of the five major classes of immunoglobulins

noun.substance

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