Researchers have developed a zebrafish model that offers new insights into how the brain acquires essential omega-3 fatty acids, including DHA and ALA. Their findings could help in designing drug molecules capable of directly reaching the brain and shed light on disruptions that can lead to neurological conditions. The study provides detailed images of the structure of Mfsd2a, which transports omega-3 fatty acids into the brain. It shows how Mfsd2a transports these essential fatty acids and how other members of this transporter family regulate important cellular functions.