leukoencephalopathies leukoencephalopathy leukokeratoses leukokeratosis leukoma leukomaine leukon leukonychia leukopenia leukopenic leukophereses leukopheresis leukoplakia leukoplakic leukopoieses leukopoiesis leukopoietic leukorrhea leukorrheal leukosarcoma leukosarcomas leukosarcomata leukosarcomatoses leukosarcomatosis leukoses leukosis leukotactic leukotactically leukotaxes leukotaxine leukotaxis leukotic