PMC:1315279 / 437-439 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T315","span":{"begin":0,"end":1},"obj":"HYPH"},{"id":"T316","span":{"begin":1,"end":2},"obj":"SYM"}],"text":"/−"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T146","span":{"begin":1,"end":2},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"/−"}