Tips for using blastp

1.A sequence in FASTA format begins with a 
  single-line description, followed by lines
  of sequence data.The description line (defline) 
  is distinguished from the sequence data by a 
  greater-than (">") symbol at the beginning. 
  It is recommended that all lines of text be 
  shorter than 80 characters in length.
2.Blank lines are not allowed in the middle of FASTA input.
3.Please use 20 letters code for amino acids.
4.U is replaced by X first before the search since it is 
  not specified in any scoring matrices.