proteasomes 800,000: ribosomes 6,000,000 Table - link
||Mouse Mus musculus
||Yewdell JW, Reits E, Neefjes J. Making sense of mass destruction: quantitating MHC class I antigen presentation. Nat Rev Immunol. 2003 Dec3(12):952-61. DOI: 10.1038/nri1250 p.958 table 2 & right column bottom paragraphPubMed ID14647477
|| Princiotta, M. F. et al. Quantitating protein synthesis, degradation, and endogenous antigen processing. Immunity 18, 343–354 (2003)PubMed ID12648452
||Primary source  abstract: "Using L929 cells [mouse], [investigators] quantitated the macroeconomics of protein synthesis and degradation and the microeconomics of producing MHC class I associated peptides from viral translation products."
||P.958 right column bottom paragraph: "L929 cells were found to have an estimated 6×10^6 ribosomes and 8×10^5 proteasomes." See note beneath table