A parallel study was performed focusing on the exploration of amino acid residues of cyclic pentapeptides by systematic substitutions of various aromatic amino acid residues [62]. (thno.org)
Structure - activity relationship studies on CXCR4 antagonists having cyclic pentapeptide scaffolds. (thno.org)
Both amino and carboxyl termini face the cytoplasm, with the latter containing ten copies of a tyrosine - rich pentapeptide repeat. (science.sciencemag.org)