Count charge of polypeptide as in [1]

This script calculates the charge of a polypeptide (string of aminoacids) with the method in [1]. This charge may be used to predict co-receptor usage of the V3 loop in HIV gp120.

1. Yu Shi, Coreceptor Usage and Sensitivity to Neutralization of HIV-1 & HIV-2, Stockholm, Karol. inst., 2004, ISBN 91-7140-093-1

Sequences separated by newlines
Source of perl(commandline) and python(both commandline, module) versions

Copyleft 2008, Tobias Abenius