I've killed Al-Mualim and I return to the lab. The doc and the assistant have a little chat and then they leave me alone. I'm waiting for a long time, I've searched the environment but there is no point to interact. Memory block 7. There is no progress. what do I have to do to continue the story?

you have to use the eagle vision with,
then go and look in Desmon room.
and that's it... you have beat Assassin's Creed.

then you can replay the missions but go sidetracked off and do what you want now