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From TEKOWiki
Protein fibres are derived from animals and include [[wool]], [[cashmere]], [[alpaca]], [[silk]] and [[leather]].
Cellulose fibres are derived from plants, and are products of agriculture. Fibres are either bast fibres (the fibre found in the stem of the plant) such as [[flax linenLinen]] or [[hemp]], or seed fibres such as [[cotton]].
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