Cure AP-4 24R Pleasant Street Unit, 2Newburyport, MA 978-358-1147 http://cureap4.org Related Rare Diseases: Spastic Paraplegia 50 Spastic Paraplegia 51 Spastic Paraplegia 52 Spastic Paraplegia 47 AP-4-Associated Hereditary Spastic Paraplegia (AP-4-HSP)