Search by Homology (using BLASTx or BLASTp)

Use this form to search for strong to medium gene homologs of your query sequence(s). This form does not search against 3' UTR sequences.

Enter Query Sequence (Nucleotide or Protein):

Paste query sequence in:


Upload file:

Query format:

Sequence type:

Mask lower-case characters in input:


Expect (E-value):

Low-complexity filter (SEG):

Options (advanced):


Questions about BLAST statistics? See Altschul's tutorial at: