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Averaged length, net charge and amino acid composition of 3251 peptides in the APD database:

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The average length of all 3251 peptides is 33.22 residues.
The average net charge of all 3251 peptides is 3.33.

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I percent is 5.91 %
V percent is 5.69 %
L percent is 8.25 %
F percent is 4.09 %
C percent is 6.81 %
M percent is 1.27 %
A percent is 7.68 %
W percent is 1.65 %

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G percent is 11.5 %
P percent is 4.67 %

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T percent is 4.48 %
S percent is 6.07 %
Y percent is 2.49 %
Q percent is 2.59 %
N percent is 3.86 %

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E percent is 2.68 %
D percent is 2.7 %
H percent is 2.17 %
K percent is 9.51 %
R percent is 5.89 %

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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.