PMC:340383 / 1162-1171 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T442","span":{"begin":0,"end":6},"obj":"NNS"},{"id":"T444","span":{"begin":7,"end":9},"obj":"IN"}],"relations":[{"id":"R209","pred":"prep","subj":"T444","obj":"T442"}],"text":"levels of"}