Dyno Therapeutics co-founder @samsinai on how his team cracked the blood-brain barrier well enough to reach 50% of neurons with a single injection: "For brain specifically, the brain has this extra layer of defense called the blood brain barrier. It's really put there to prevent anything to get in." "What we have done is actually in primates we can show that we can get up more than 50% of neurons, through a systemic injection." "You're just injecting in the veins, and then the virus actually…