How do you start them?
I met subject sixteen for the first time and was then put into DNA Sequence 1. Completed that, and was brought back to sixteen. When do the Desmond sequences actually start? Because going by the trophy list I thought it would be something like Desmond Sequence 1 > DNA Sequence 1 > Desmond Sequence 2 > DNA Sequence 2 and so on. But I can't yet go on the Desmond levels. I'm guessing you need to do a little more of Ezio's story before starting Desmond's?