PMC:1189074 / 690-693 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T177","span":{"begin":0,"end":1},"obj":"SYM"},{"id":"T178","span":{"begin":1,"end":2},"obj":"HYPH"},{"id":"T179","span":{"begin":2,"end":3},"obj":"SYM"}],"text":"−/−"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T301","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"},{"id":"T302","span":{"begin":2,"end":3},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"−/−"}