PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15111717-7 2004 These results imply that the endogenous ethylene in L. japonicus roots inhibits rhizobial infection at the primary nodulation, probably via NIN gene, and suggest that ethylene perception assists negative feedback regulation of secondary nodule initiation. ethylene 40-48 nin Lotus japonicus 140-143