For generations, antibody therapies have patrolled only the outer walls of the cell, unable to reach the hidden machinery where many of the most tenacious diseases are born. A team at Cornell University has now devised a molecular disguise — a cloaking technique using negatively charged ions — that allows these powerful drugs to slip inside cells aboard lipid nanoparticles, arriving where they were never before able to go. Validated independently for both Parkinson's disease and lung inflammation, the approach suggests that the long-standing boundary between extracellular medicine and intracel