Features of the various ALK fusion proteins occurring in ALK⁺ anaplastic large cell lymphomas.

§ indicates tyrosine kinase domain of the ALK protein; *, also occurs as an 85-kd (TFG-ALK short) fusion protein; **, 5 aminoimidazole-4-carboxamide-1-beta-d-ribonucleotide transformylase/IMP cyclohydrolase.