title: Letter: Ph-1 chromosome and loss and reappearance of the Y chromosome in acute lymphocytic leukaemia.
mesh_terms: D002460:Cell Line; D002675:Child, Preschool; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D002999:Clone Cells; D006801:Humans; D007945:Leukemia, Lymphoid / Q000235:genetics*; D008297:Male; D012730:Sex Chromosomes