This page is designed for searching peptides with desired amino acids composition. Here, you may select a composition range for an amino acid. For example, if you wish to know all cell-penetrating peptides having more than 5 percent composition of alanine, then you may select the minimum value for alanine as 5. One of the major features of this page is that its output composition table can be sorted on the basis of composition of any amino acid. For more information, see the HELP page.