PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 18275171-1 2008 The bond length of a carbon-carbon sp2-sp2 sigma-bond without the perturbing effects of pi-interactions has been estimated by high level calculations on two prototypical systems: a 90 degrees -twisted form of butadiene and the tub conformer of cyclooctatetraene. 1,3-butadiene 209-218 Sp2 transcription factor Homo sapiens 35-38 18275171-1 2008 The bond length of a carbon-carbon sp2-sp2 sigma-bond without the perturbing effects of pi-interactions has been estimated by high level calculations on two prototypical systems: a 90 degrees -twisted form of butadiene and the tub conformer of cyclooctatetraene. 1,3-butadiene 209-218 Sp2 transcription factor Homo sapiens 39-42