Assertion: peptide's residue | /r/HasProperty | lysine located 30 residues
Facets:
value: upstream from the central lysine
type: LOCATION
Source sentences:
text: In addition to this, the preceding tryptic residue is a lysine located 30 residues upstream from the central lysine (i.e. outside the N-terminal cleavage window in Table 7S), thereby producing a very long N-terminal extension to any tryptic peptide.