A therapy using pig semen-derived exosomes, engineered into eye drops capable of penetrating deep into retinal tissue, may hold the key to breaching the brain’s defences against diseases like Alzheimer’s. This advance, led by Professor Zhang Yu at China’s Shenyang Pharmaceutical University, originally targeted a rare childhood eye cancer retinoblastoma that often resists conventional treatments due to its delicate location near the brain. Published in peer-reviewed journal Science Advances on...