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Structure of the primary plant cell wall, showing major structural polymers and their likely arrangement in the wall. Cellulose microfibrils are crystalline aggregates of (1 → 4) β-d-glucans and contain noncrystalline regions that may be formed by entrapment of hemicelluloses. Hemicelluloses can also bond to the surface of cellulose and may link two microfibrils together. Pectins form a hydrophilic gel that surrounds and embeds the microfibrils.
