PubMed:8115596 / 134-288 JSONTXT

{"project":"sentences","denotations":[{"id":"TextSentencer_T3","span":{"begin":0,"end":154},"obj":"Sentence"},{"id":"T3","span":{"begin":0,"end":154},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The effects of natural selection on genes expressed in fetuses, however, may be opposed by the effects of natural selection on genes expressed in mothers."}