sub:provenance {
  beldoc: dce:description "Approximately 61,000 statements." ;
    dce:rights "Copyright (c) 2011-2012, Selventa. All rights reserved." ;
    dce:title "BEL Framework Large Corpus Document" ;
    pav:authoredBy sub:_6 ;
    pav:version "20131211" .
  sub:_5 prov:value "This substrate (ELK1) could be phosphorylated to a stoichiometry of 3.3 mol of phosphate by incubation with homogeneous ERKI, consistent with the presence of at least four phosphorylation sites....Peptide B contained only one serine, thus pinpointing the phosphorylation site S389.....S324 and S422 are inferred as the phosphorylated sites in peptides D and E, respectively. These peptides were highly purified and each contained exclusively serine phosphate. C appeared to contain only one serine, thus strongly suggesting that S383 is also a site.....The phosphopeptide maps also demonstrate phosphorylation of T336, not identified previously by peptide sequencing." ;
    prov:wasQuotedFrom pubmed:7889942 .
  sub:_6 rdfs:label "Selventa" .
  sub:assertion prov:hadPrimarySource pubmed:7889942 ;
    prov:wasDerivedFrom beldoc: , sub:_5 .
}