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a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
a serious and potentially fatal medical state caused by an allergic reaction, in which sufferers...
the cone-shaped region of the renal medulla, made up of the loops of Henlé and the collecting...
neurons that have two outgrowths coming directly from the cell body.
a chemical messenger produced and released by a cell or a gland in one part of the body of the...