PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8142406-0 1994 Characterization of the active site of p21 ras by electron spin-echo envelope modulation spectroscopy with selective labeling: comparisons between GDP and GTP forms. Guanosine Triphosphate 155-158 H3 histone pseudogene 16 Homo sapiens 39-42