Scientists have identified two brain receptors that help the brain remove amyloid beta, a hallmark of Alzheimer's disease. By stimulating these receptors in mice, they increased the levels of a natural amyloid-splitting enzyme. This reduced the accumulation of amyloid in the brain. Memory-related behavior also improved. These receptors are common targets of existing drugs. The findings could lead to an affordable treatment in pill form. Such a treatment would have fewer side effects.