Thanks for your suggestion. I am very familiar with PCR testing in so far that I use it regularly in some areas of my work, but I do not consider myself an absolut expert in it. I will keep this in the back of my head or maybe ask one of my colleagues to write a guest piece to go into PCR in more detail. In the meantime, there are some very useful youtube videos: https://www.youtube.com/watch?v=2KoLnIwoZKU the DNA Learning Center playlist will have more.