Cytogenetic abnormalities in paroxysmal nocturnal haemoglobinuria usually occur in haematopoietic cells that are glycosylphosphatidylinositol-anchored protein (GPI-AP) positive. - Sloand, Elaine M.; Fuhrer, Monika; Keyvanfar, Keyvan; Mainwaring, Lori; Maciejewski, Jaroslaw; Yu Wang; Johnson, Sarah; Barrett, A. John; Young, Neal S. (British Journal of Haematology, 2003)