Assertion: papaya's beta carotene | /r/HasProperty | a precursor of vitamin a
Facets:
value: among all the carotenoids
type: OTHER
Source sentences:
text: Papaya is also an excellent source of antioxidants, such as beta carotene, a precursor of vitamin A, and vitamin C (ascorbic acid) that prevents the cellular damage caused by free radicals and promote cardiovascular health.
text: Among all the carotenoids, only beta-carotene and beta-cryptoxanthin are precursors of provitamin A.
text: It has been engineered with three genes that biosynthesise beta-carotene, a precursor of vitamin A, in the edible parts of rice.