<unk> s are organic pigments that are naturally occurring in plants and some other photosynthetic organisms like algae, some types of fungus and some bacteria.
There are over 600 known<unk> s; they are split into two classes, xanthophylls and carotenes. They absorb blue light.
Carotenoid
Short chain fatty acid
Diol
Retinoid
Eicosanoid
Cardiac glycoside
Essential fatty acid
Polyphenol