Proteins 'clock' the origins of all creatures--great and small.
Morell
V
V
D000595:Amino Acid Sequence; D000818:Animals; D001105:Archaea / Q000145:classification; D001419:Bacteria / Q000145:classification; D000458:Cyanobacteria; D004798:Enzymes / Q000737:chemistry*; D005057:Eukaryotic Cells / Q000145:classification / Q000201:enzymology; D019143:Evolution, Molecular; D005580:Fossils; D010802:Phylogeny; D011387:Prokaryotic Cells / Q000145:classification / Q000201:enzymology
D004798:Enzymes