PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 18305207-5 2008 Constitutive tuber-specific apyrase expression did not lead to a reduction of ATP, but rather a decrease in ADP and an increase in AMP levels. Adenosine Monophosphate 131-134 apyrase Solanum tuberosum 28-35