PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2199064-1 1990 The X-ray structures of the guanine nucleotide binding domains (amino acids 1-166) of five mutants of the H-ras oncogene product p21 were determined. Guanine Nucleotides 28-46 HRas proto-oncogene, GTPase Homo sapiens 106-111