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Averaged length, net charge and amino acid composition of 3055 peptides in the APD database:

Error: Meet Whitespace at # 0 residue
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The average length of all 3055 peptides is 32.91 residues.
The average net charge of all 3055 peptides is 3.30.

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I percent is 5.91 %
V percent is 5.7 %
L percent is 8.36 %
F percent is 4.08 %
C percent is 6.86 %
M percent is 1.24 %
A percent is 7.63 %
W percent is 1.66 %

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G percent is 11.58 %
P percent is 4.66 %

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T percent is 4.48 %
S percent is 6.07 %
Y percent is 2.46 %
Q percent is 2.54 %
N percent is 3.85 %

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E percent is 2.68 %
D percent is 2.63 %
H percent is 2.14 %
K percent is 9.58 %
R percent is 5.76 %

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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.