The exact URL is: http://expasy.hcuge.ch/ch2d/pi_tool.html (ExPASy - Compute pI/Mw tool) Cheers, Darren -- Darren Tyson, Grad Student Cell and Molecular Biology Saint Louis University, St. Louis, MO tysondr at slu.edu or darren at primary.net http://scimart.com/darren/ soon to be updated and moved to http://www3.primary.net/~darren/