PubMed:8276880 / 1036-1247 JSONTXT

{"project":"sentences","denotations":[{"id":"T20","span":{"begin":0,"end":211},"obj":"Sentence"},{"id":"T20","span":{"begin":0,"end":211},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The addition of serum to cells growing in serum-free medium caused a concentration-dependent increase in N-CAM and L1 expression; however, serum did not potentiate the induction of N-CAM and L1 by 40 ng/ml OP-1."}