PMC:7795856 / 30518-30696 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T180","span":{"begin":0,"end":178},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The eluted protein fraction was directly injected into a maXis quadrupole time of flight (Q-TOF) instrument (Bruker Daltonics, Bremen, Germany) operated in the positive ion mode."}