PMC:1626108 / 1413-1417 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T476","span":{"begin":2,"end":3},"obj":"SYM"},{"id":"T477","span":{"begin":3,"end":4},"obj":"HYPH"}],"text":"P2−/"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T199","span":{"begin":2,"end":3},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"P2−/"}