Embodiments of the invention include methods for selecting in parallel (i.e., synchronously or simultaneously) peptides that target a number of organs, in which each peptide targets distinct tissues or organs. Typically, the methods of the invention provide for peptide selection in a Minimal number of subjects and still provides a selectively binding peptide. In certain aspects, methods of identifying peptides that bind to multiple selected tissues or organs of an organism may comprise the steps of administering a phage display library to a first subject obtaining a sample of two or more selected tissues obtaining phage displaying peptides that bind to the samples from the first subject enriching for peptides by administering phage isolated from the samples of the first subject to a second subject obtaining a sample of two or more selected tissues from the second subject and identifying the peptides displayed.
