PMC:1315279 / 721-723 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T383","span":{"begin":1,"end":2},"obj":"SYM"}],"text":"8−"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T158","span":{"begin":1,"end":2},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"8−"}