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||Bacteria Escherichia coli
||Arnold RJ, Reilly JP. Observation of Escherichia coli ribosomal proteins and their posttranslational modifications by mass spectrometry. Anal Biochem. 1999 Apr 10 269(1):p.108 table 1PubMed ID10094780
||matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-MS)
||55 of the 56 subunit proteins were observable. (Wikipedia, ribosomal protein:) "All of them are different with three exceptions: one protein is found in both subunits (S20 and L26), L7 and L12 are acetylated and methylated forms of the same protein, and L8 is a complex of L7/L12 and L10."
||Ron Milo, Paul Jorgensen, Mike Springer