HOXA9 and leukemia: To examine the possible development of leukaemia-like phenotype in adult fish, Tg(drl:hoxa9;hsp70:meis1) embryos and control sibling including WT, Tg(drl:hoxa9) and Tg(hsp70:meis1) were heat shocked once at 24 hpf for 1 h, and were then grown to adulthood.