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

Potassium channel (Protein Data Bank entry 1bl8) on a dark slate blue background with potassium ions shown in firebrick. The channel is comprised of four chains. Each chain has been rainbow-colored from blue at the N-terminus to red at the C-terminus, but only the surface of the channel is shown. The surface has been sliced with a per-model clipping plane. The surface cap color is plum except with opacity set to 0.8. The shininess and brightness have been set to 128 and 8, respectively, and the lights on the scene have been moved from their default positions. The subdivision quality (related to the smoothness of the spherical ions) is 5.0, and the molecular surface was computed with probe radius and vertex density set to 1.0 and 6.0, respectively. (More samples...)