PMC:1315279 / 6686-6687 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T1773","span":{"begin":0,"end":1},"obj":"SYM"}],"text":"−"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T1012","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"−"}