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It also offers a CSV output, an alternative format understood by spreadsheets.

The table has both 1-letter and 3-letter amino acid abbreviations, sorted by 3-letter codes. ExPASy's ProtParam generates a table readily imported into a spreadsheet.Check 3 delimiter options: Tab, Space, Treat consecutive delimiters as one. In Excel, in an existing (possibly empty) spreadsheet, File, Import, Text. Importing Composition Data Into Excel: Copy the data columns only, paste into a plain text editor and save to a plain text file. The table has both 1-letter and 3-letter amino acid abbreviations, sorted by 1-letter codes. EMBL-EBI's EMBOSS-PepStats generates a table readily imported into a spreadsheet.Protein Information Resource's (PIR's) Composition/Molecular Weight Calculator makes a very useful bar graph (see example above) but does not provide a spreadsheet-ready table.Compositional variability ranks archaea > baceteria > eukaryotes.Habitat: The environment in which an organism lives has a minor effect on the average composition of its proteins.domains: Linkers between domains have more polar residues, while compact domains have more hydrophobic residues. Trp is constant at about 1.4% for lengths 75-200.Leu and Tyr are highest in short and long chains, and less frequent in middle-sized proteins.Decreased with length: Cys, Phe, His, Ile, Lys, Met, Asn, Ser.Increased with length, reaching a plateau: Ala, Asp, Glu, Gly, Pro, Val less increase for Gln and Thr.A study of ~550,000 proteins with lengths 50-200 amino acids concluded: Average lengths are 283 and 340, respectively. Proteins of thermophiles are, on average, shorter than those of mesophiles. This likely relates to the larger number of salt bridges in proteins of thermophiles, believe to contribute to thermostability. Thermophiles have more glutamic acid (with reduction in glutamine), and more lysine and arginine. Growth temperatures (mesophily/thermophily/hyperthermophily).GC-content of the organism's genome is the strongest genome-level determinant of amino acid composition. These data are included in the above-linked spreadsheet. The above percentages were determined for several thousand sequences of diverse proteins of length 200 residues, with sequence identities below 50%.