Skoolmom, I don't know if you've checked out the Her2 News section on this site. There's a link to Genentech's web site, which takes you to a pretty good tutorial on Her2 and Herceptin. To get there, click on "Home", then "Her2 Gene", then "What is Her2?" to get to Genentech's page. Also, here's a shortcut to the link:
Genentech
http://www.gene.com/gene/products/ed...er2disease.jsp
<3 Lolly