Assertion: carotenoid | /r/AtLocation | many groups of microorganisms
Facets:
value: very
type: DEGREE
Source sentences:
text: Some carotenoids are very common in many groups of microorganisms (e.g. β-carotene); others are only synthesized by a limited number of species, e.g. salinixanthin in the bacterium Salinibacter ruber.