JAK3 and anaplastic large cell lymphoma: MAC-1 and MAC-2A carry heterozygous JAK3 mutations at chr19: 17,945,696 (C- > T) with allelic depths of 0.530 and 0.500, respectively, but absent from other ALCL/CTCL cell lines (FE-PD, HH, L-82, MY-LA, SE-AX).