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Table 3 SAARs composition by amino acid.

From: COPASAAR – A database for proteomic analysis of single amino acid repeats

Amino Acid Eukaryotes Archaea Bacteria
Arginine 0.75% 0.75% 0.74%
Lysine 1.0% 1.05% 0.72%
Glutamic Acid 1.28% 1.45% 0.89%
Aspartic Acid 0.67% 0.65% 0.55%
Glutamine 0.57% 0.18% 0.42%
Asparagine 0.63% 0.37% 0.35%
Histidine 0.17% 0.09% 0.13%
Proline 0.83% 0.42% 0.43%
Tyrosine 0.23% 0.37% 0.21%
Tryptophan 0.04% 0.04% 0.04%
Serine 1.76% 0.90% 0.85%
Threonine 0.68% 0.60% 0.59%
Glycine 0.90% 1.10% 1.09%
Alanine 1.14% 1.38% 1.92%
Methionine 0.10% 0.11% 0.12%
Cysteine 0.10% 0.03% 0.04%
Phenylalanine 0.38% 0.38% 0.37%
Leucine 1.87% 1.95% 2.02%
Valine 0.80% 1.31% 1.03%
Isoleucine 0.61% 1.23% 0.74%
  1. Legend: The dominant amino acids are leucine and serine (Eukaryotes), leucine and glutamic acid (Archaea), and leucine and alanine (Bacteria). Amino acids considered highly abundant are highlighted in bold.