Every person possesses the same genes within every cell. Their DNA provides the information to first create an entire functioning body and then keep it running. While all humans share more than 99.9% of their DNA, it is the subtle differences in our DNA that ensure individuality. Many differences are superficial effects, like hair colour, but some can have disastrous health effects. Scott Wilcockson talks to Dr Stephanie Bezzina-Wettinger (Faculty of Health Sciences, University of Malta) about her research on these subtle differences and how they can contribute to heart attacks.