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a complex chemical compound that fills the spaces in the cell wall between cellulose, hemicellulose, and pectin components, especially in tracheid, sclereid and other xylem cells. This makes the cell walls hard, woody and waterproof.
the clear colourless fluid that occurs in the spaces, such as the ventricles and central canal,...
a substance, usually a liquid, in which other substances can dissolve.
process whereby excess amino acids are broken down in the liver to form urea.