Assertion: tryptic peptide | /r/CapableOf | become protonated
Facets:
value: in the electrospray-ionization process
type: TEMPORAL
value: doubly
type: DEGREE
value: usually
type: TEMPORAL
Source sentences:
text: In the electrospray-ionization process, tryptic peptides usually become doubly protonated and are then designated (M + 2H)2+, in which M is the mass of the peptide and H+ is the mass of a proton.