thumb|class=skin-invert-image|Chemical structure of β-carotene, a common natural pigment|420px
via PubMed
thumb|class=skin-invert-image|Chemical structure of β-carotene, a common natural pigment|420px
Carotenoids () are yellow, orange, and red organic pigments that are produced by plants and algae, as well as several bacteria, archaea, and fungi. Carotenoids give the characteristic color to pumpkins, carrots, parsnips, corn, tomatoes, canaries, flamingos, salmon, lobster, shrimp, and daffodils. Over 1,100 identified carotenoids can be further categorized into two classes xanthophylls (which contain oxygen) and carotenes (which are purely hydrocarbons and contain no oxygen).
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).