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 the structure of the human TRPA1 ion channel (wasabi receptor) determined by electron cryo-microscopy, Protein Data Bank entry 3j9p. The four subunits of the tetramer are shown as ribbons in different colors over a dark-to-light gradient background. (More samples...)