PMC:1315279 / 21836-21843 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T4741","span":{"begin":3,"end":4},"obj":"SYM"},{"id":"T4742","span":{"begin":4,"end":5},"obj":"HYPH"},{"id":"T4743","span":{"begin":5,"end":6},"obj":"SYM"}],"text":"m68−/− "}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T4153","span":{"begin":3,"end":4},"obj":"SO_EXT:sequence_nullness_or_absence"},{"id":"T4154","span":{"begin":5,"end":6},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"m68−/− "}