Localization of the cross-linking sites of RGD and KQAGDV peptides to the isolated fibrinogen receptor, the human platelet integrin glicoprotein IIb/-IIIa. Influence of peptide length - Calvete, J J; Schafer, W; Mann, K; Henschen, A; Gonzales-Rodriguez, J (Eur J Biochem, 1992)