Assertion: guanine's form | /r/CapableOf | occur near the ends of the chromosomes
Facets:
value: often
type: TEMPORAL
value: naturally
type: MANNER
Source sentences:
text: The unimolecular forms often occur naturally near the ends of the chromosomes, better known as the telomeric regions, and in transcriptional regulatory regions of multiple genes, both in microbes and across vertebrates  including oncogenes in humans.