PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 9053826-1 1996 Retinoic acid-dependent homeobox Hoxb-1 gene expression offers an unanticipated example of both a positive and a negative transcriptional activity of RA, as exerted at different times during embryogenesis. retinoic 0-8 homeobox B1 Homo sapiens 33-39