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LTK, ALK and Ros have been identified as receptor tyrosine kinases having sequence similarity to the insulin receptor subfamily of kinases. LTK (leukocyte tyrosine kinase) is expressed in murine B lymphocyte precursors and has also been found in forebrain neurons. ALK (anaplastic lymphoma kinase) is normally highly expressed, specifically in the nervous system. A truncated form containing the catalytic domian of ALK is expressed as the result of a translocation occurring in many non-Hodgkin's lymphomas. The c-Ros gene was originally identified in mutant form as an oncogene. Ros is normally expressed in a small number of epithelial cell types and may play a role in epithelial development.