PMC:1315279 / 719-724 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T383","span":{"begin":3,"end":4},"obj":"SYM"},{"id":"T384","span":{"begin":4,"end":5},"obj":"HYPH"}],"text":"m68−/"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T158","span":{"begin":3,"end":4},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"m68−/"}