RT Journal Article SR Electronic T1 Molecular Targeting with Peptides or Peptide-Polymer Conjugates: Just a Question of Size? JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 1940 OP 1945 VO 46 IS 12 A1 Hans-Jürgen Wester A1 Horst Kessler YR 2005 UL http://jnm.snmjournals.org/content/46/12/1940.abstract AB