TOTAL PROTEINS ON EARTH. “The protein universe, the totality of all proteins in all organisms on earth, is vast. Taking the estimated 13.6 million species of living organisms on Earth, which is very likely to be an underestimate, into account, there are >10(10) to 10(12) different proteins in all organisms from the three domains of life (Eukarya, Bacteria, and Archaea) on Earth. However, this vast number of proteins are predicted to consist of only ≈10(5) sequence domain families, the members of each family having similar amino acid sequences.”
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