Proteins

NCBI's Protein resources include protein sequences and structures and related comparison and visualization tools, as well as databases and tools to predict and analyze functional domains.

How to

Protein Sequences

Functional Domains

Three-dimensional Structures

Supporting Resources

Taxonomy
taxonomic classification and nomenclature catalog
GenBank
primary nucleotide sequence repository
RefSeq
curated, non-redundant biological sequence set
BioProject
catalog of high-throughput genome-wide studies
BioSample
sample repository for the BioProjects database

Additional Tools

ProSplign
aligns protein sequences to genomes
Genome ProtMap
maps microbial protein coding regions to genomes
iCn3D
displays interactive 3D structures in a web browser