hivgene.com was available and directly related to the first iteration of our startup.

More recently, we were looking for names for something of an expanded version of the startup and my cofounder and we sat plugging away at instantdomainsearch.com and IMing each other available names as we found them. This got us xygene.com. I couldn't have asked for anything better.

I think we're just really, really lucky with domain names.