HIV meds suppress the virus. But to create a cure, it's necessary to get at the pockets of virus that evade the meds, hiding in places like resting CD4 cells or the brain. The experimental immune-based therapy IL-7 (interleukin-7, a synthetic form of an immune system protein) is one that takes on this task. It activates hiding HIV, flushing the virus from its lairs so it can be targeted by drugs.