Because of some rather clumsy editing, the second sentence of this article by A L Lennard and G H Jackson (12 August, pp 433-7) read: “Allogeneic transplants are haemopoietic stem cells from the bone marrow, peripheral blood, or umbilical cord blood. . . .” A more felicitous turn of phrase would be: “For allogeneic transplants, haemopoietic stem cells are taken from. . . .”