PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
31147890-1	2019	Nitrogen-centered and beta-carbon-centered hydrogen-deficient peptide radicals are considered to be intermediates in the matrix-assisted laser desorption/ionization in-source decay (MALDI-ISD)-induced Calpha-C bond cleavage of peptide backbones when using an oxidizing matrix.	Nitrogen	0-8	carbonic anhydrase 2	Homo sapiens	201-209	
31147890-3	2019	The calculations indicate that the nitrogen-centered radical immediately undergoes Calpha-C bond cleavage, leading to the formation of an a /x fragment pair.	Nitrogen	35-43	carbonic anhydrase 2	Homo sapiens	83-91	
31147890-8	2019	The intense signal arising from d fragments and the lack of or weak signal from a fragments strongly suggest that the Calpha-C bond cleavage occurs through a nitrogen-centered radical intermediate.	Nitrogen	158-166	carbonic anhydrase 2	Homo sapiens	118-126