... and cannot be substituted by Gly-Pro-Pro, Gly-Pro-Ala or Gly-Pro-Arg, showing that theplatelet-reactivity of fibrillar collagen is not just an intrinsic property of the triple-helical ... repeatingGly-Pro-Hyp motif, that mimic the collagen tertiary (triple-helical) structure. Theseauthors have shown that, when cross-linked to impact quaternary (polymeric) structure,these ... shown to be closely associated with the pp60c~"c-related protein tyrosinekinases fyn, lyn, and yes in non-activated platelets but not after their activation64 and to be...