Amino Acid Sequence Data base for Peptides?



 Hello,
 I am looking for a database of peptide sequences of
 naturally occuring and  synthesized ones available
 so far.  Please note that my interest is only in
 Linear and Cyclic peptides and not Proteins.
 Is there a collection like this either
 commercially or for free?
 Please reply me directly if you can,  and I will post
 a summary to the net.  Thank you very much.
 Sincerely,
 K. Ramnarayan, Ph.D.
 email: raman%aditya' at \`uunet.uu.net