Dear Amina,
Try the sites listed below:
http://expasy.hcuge.ch/ch2d/pi_tool.html
http://www-biol.univ-mrs.fr/d_abim/compo-p.html
http://www.expasy.ch/cgi-bin/protscale.pl
http://bmbsgi11.leeds.ac.uk/bmb5dp/profiles.html
Regards,
Igor Rodionov
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