Whack-a-Bug is one of the demos I will show at VIZBI 2014. After tinkering with it for a while to make it independent from the MASS Toolbox (web embedded CDFs don't like external dependencies ...) I was able to embed a live version of it here in this post. You might have to click on the panel first to be able to tease E. coli (by removing its reactions one by one). Deleted reactions will be crossed out in red. A deletion can be reverted by clicking on the corresponding red cross. Have fun!