The Blast Protein tool performs a blast or psiblast search of pdb or nr for sequences similar to a query, using a Web service hosted by the UCSF RBVI. The query can be:

• a chain from a structure open in Chimera
• a sequence pasted as plain text
• a sequence from an alignment in Multalign Viewer

• as a pseudo-multiple sequence alignment (a consolidation of the pairwise alignments of individual hits to the query), automatically shown in Multalign Viewer
• as structures (for hits from pdb), automatically superimposed according to the pseudo-multiple alignment

The image shows tetramers of influenza neuraminidase (Protein Data Bank entry 3k3a) styled as flowers. Three tetramers are colored pink, with a central metal ion in white and nearby residues in yellow, and a fourth tetramer is colored green to resemble leaves. Each monomer or “petal” is a six-bladed β-propeller. (More samples...)