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a thin, flexible layer of the plant cell wall inside the middle lamella. It consists mainly of cellulose, hemicellulose and pectin as well as cutin and wax where it forms the cuticle.
a system of support in soft-bodied animals, which relies on pressure of fluids in the body...
simple epithelium with flattened cells found in the inner lining of the mouth, oesophagus and...