PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 10493937-6 1999 The quinonoid spectral intermediate commonly seen in the case of SHMT was also seen in the case of D89N mutant tetramer, although the amount of intermediate formed was lower. quinonoid 4-13 serine hydroxymethyltransferase, cytosolic Ovis aries 65-69 9305893-13 1997 These results suggest that His-150 may be the base that abstracts the alpha-proton of the substrate, leading to formation of the quinonoid intermediate in the reaction catalyzed by SHMT. quinonoid 129-138 serine hydroxymethyltransferase, cytosolic Ovis aries 181-185