Assertion: uracil | /r/HasProperty | = +44.5‰
Facets:
Source sentences:
text: Isotope measurements found that uracil (δ13C = +44.5‰) and xanthine (δ13C = +37.7‰) in the Murchison meteorite showed an enrichment of the 13C isotope compared with uracil extracted from soil at the site of the Murchison fall (δ13C = −10.6‰), suggesting that the uracil and xanthine in Murchison are extraterrestrial in origin (Martins et al., 2008).