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Averaged length, net charge and amino acid composition of 3160 peptides in the APD database:

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The average length of all 3160 peptides is 33.26 residues.
The average net charge of all 3160 peptides is 3.32.

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I percent is 5.89 %
V percent is 5.67 %
L percent is 8.27 %
F percent is 4.09 %
C percent is 6.81 %
M percent is 1.25 %
A percent is 7.62 %
W percent is 1.65 %

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G percent is 11.56 %
P percent is 4.7 %

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T percent is 4.49 %
S percent is 6.06 %
Y percent is 2.5 %
Q percent is 2.58 %
N percent is 3.85 %

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E percent is 2.7 %
D percent is 2.69 %
H percent is 2.17 %
K percent is 9.51 %
R percent is 5.87 %

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If you want statistical information for a group of peptides, you can search the database first.
Then select 'show statistic data' at the bottom of the 'query result' page.