[BiO BB] Problem with BLAST

[Balaji]

Hi everyone,
   I have a protein that comprises only of Alanine(A), Glycine(G),
Cysteine(C) and Threonine(T). When i try to use NCBI BLAST with this
protein, the blast program returns an error saying that the entered
sequence is a nucleotide (as it evidently has only A's, T's, C's and
G's) and not a protein sequence.
   Is there anyway i work around the problem? I'll be grateful for any help
Thanks in advance
Balaji