About: http://webisa.webdatacommons.org/428247122

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Also, modifications such as phosphorylation, sulfation, and glycosylation are unstable during tandem mass spectrometry experiments making identification and positional information difficult to obtain.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com