NAST: a multiple sequence alignment server for comparative analysis of 16S rRNA genes. - Todd Z. DeSantis; Philip Hugenholtz; Keith Keller; Eoin L. Brodie; Niels Larsen; Yvette M. Piceno; Richard Phan; Gary L. Andersen (Nucleic Acids Res., 2006)

MicrobesOnline: an integrated portal for comparative and functional genomics. - Paramvir S. Dehal; Marcin P. Joachimiak; Morgan N. Price; John T. Bates; Jason K. Baumohl; Dylan Chivian; Greg D. Friedland; Katherine H. Huang; Keith Keller; Pavel S. Novichkov; Inna Dubchak; Eric J. Alm; et al. (Nucleic Acids Res., 2010)

metaMicrobesOnline: phylogenomic analysis of microbial communities. - Dylan Chivian; Paramvir S. Dehal; Keith Keller; Adam P. Arkin (Nucleic Acids Res., 2013)