PubMed:21684788 / 255-264 JSONTXT

{"project":"LitCoin-GeneOrGeneProduct-v0","denotations":[{"id":"T9","span":{"begin":3,"end":9},"obj":"GeneOrGeneProduct"}],"text":"an enzyme"}

{"project":"LitCoin-GeneOrGeneProduct-v2","denotations":[{"id":"T7","span":{"begin":3,"end":9},"obj":"GeneOrGeneProduct"}],"text":"an enzyme"}