Welcome to Functional Residue Frequency page of CPPsite 2.0

This page is designed for searching peptides with desired frequency of functional amino acids like frequency of charged, polar, hydrophobic residues. Here, you may select frequency range for a functional amino acid. For example, if you wish to know all cell penetrating peptides having more than four aliphatic residues then you may select minimum value for aliphatic as 4. One of the major features of this page is that its output frequency table can be sorted on the basis of frequency of functional amino acid. For more information see HELP page.
Property of Amino AcidsFrequency Range
Minimum  Maximum 
Negative charge
Positive charge