||Bacteria Escherichia coli
||Adrian H. Elcock and Andrew S. Thomas Molecular Behavior in Biological Cells, The Bacterial Cytoplasm as a Model System, in MOLECULAR MACHINES link p.1 bottom paragraph
||J. Cayley, B. A. Lewis, H. J. Guttman and M. T. Record Jr. 1991. Characterization of the cytoplasm of Escherichia coli K-12 as a function of external osmolarity. J Mo Biol 222, 281–300.PubMed ID1960728
||The macromolecular concentration in the cytoplasm of the bacterium
Escherichia coli is around 300 mg/mL, of which ~220 mg/mL is protein (primary source).