PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
234740-4	1975	Results of difference spectroscopy and observation of the C-2 resonance of an additional titratable histidine in some of these spectra suggest a conformational change in the enzyme, while the large number of unaltered resonances indicates involvement of only a few residues.	Histidine	100-109	complement C2	Homo sapiens	58-61