Stoke Therapeutics Inc. (Nasdaq: STOK) has pulled in Biogen (Nasdaq: BIIB) to help it develop and commercialize a treatment it’s working on for Dravet syndrome, a rare, debilitating form of epilepsy that affects children.

Biogen has entered a collaboration with Stoke Therapeutics to develop and and commercialise zorevunersen to treat Dravet syndrome in all territories outside Canada, Mexico and the US. Dravet syndrome is a genetic developmental and epileptic encephalopathy characterised by cognitive and behavioural impairments and recurrent seizures.

The partnership splits the rights to Stoke’s epilepsy antisense oligonucleotide, with up to $385 million in potential payments due to Stoke.

Biogen Inc. (NASDAQ:BIIB) and Stoke Therapeutics, Inc. (NASDAQ:STOK) collaborated to develop and commercialize zorevunersen for Dravet syndrome in all territories outside the United States, Canada, and Mexico.

Biogen and Stoke Therapeutics have signed a partnership agreement to co-develop and sell Stoke’s experimental treatment for Dravet syndrome, a severe form of epilepsy, outside the U.S., the companies said this morning.