PMC:1189074 / 27705-27706 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T6980","span":{"begin":0,"end":1},"obj":"SYM"}],"text":"−"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T7163","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"−"}