Sometimes a single letter change in a protein, a single amino acid change to be precise, can change your life. And I'm not talking about some horrible disease, I'm talking about something good! As a life long milk intolerant I've looked longingly at others consuming lattes, sipping hot chocolates, devouring various cheeses and having their pick of smoothies. Well no longer. And its all down to a single amino acid spelling mistake. It turns out that the milk protein, beta-Caes