The chemical reactions and pathways resulting in the breakdown of a fatty acid in the absence of oxygen. A fatty acid is any of the aliphatic monocarboxylic acids that can be liberated by hydrolysis from naturally occurring fats and oils. Fatty acids are predominantly straight-chain acids of 4 to 24 carbon atoms, which may be saturated or unsaturated; branched fatty acids and hydroxy fatty acids also occur, and very long chain acids of over 30 carbons are found in waxes.
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GOC:mengo_curators,
PMID:17329794