PMC:1315279 / 1176-1177 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T464","span":{"begin":0,"end":1},"obj":"SYM"}],"text":"−"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T195","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"−"}