title: Determining divergence times with protein clocks.
authors.affiliation: Center for Molecular Genetics, University of California, San Diego, La Jolla 92093-0634, USA.
authors.forename: R F
authors.initials: RF
authors.lastname: Doolittle
authors.forename: D F
authors.initials: DF
authors.lastname: Feng
authors.forename: G
authors.initials: G
authors.lastname: Cho
mesh_terms: D000595:Amino Acid Sequence; D001105:Archaea / Q000145:classification / Q000201:enzymology*; D001419:Bacteria / Q000145:classification / Q000201:enzymology*; D005075:Biological Evolution; D005057:Eukaryotic Cells / Q000145:classification / Q000201:enzymology*; D010802:Phylogeny; D017386:Sequence Homology, Amino Acid