The chemical reactions and pathways involving polyketides, any of a diverse group of natural products synthesized via linear poly-beta-ketones, which are themselves formed by repetitive head-to-tail addition of acetyl (or substituted acetyl) units indirectly derived from acetate (or a substituted acetate) by a mechanism similar to that for fatty acid biosynthesis but without the intermediate reductive steps. [GOC:mah, ISBN:0198506732]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process