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Proto-Oncogene Proteins A-raf: A raf kinase subclass expressed primarily in non-neuronal tissues such as SKELETAL MUSCLE. The A-raf kinases are MAP kinase kinase kinases that have specificity for MAP KINASE KINASE 1.DNA, Concatenated: Head to tail array of covalently joined DNA sequences generated by concatenation. Concatenated DNA is attached end to end in contrast to CATENATED DNA which is attached loop to loop.Proto-Oncogene Proteins: Products of proto-oncogenes. Normally they do not have oncogenic or transforming properties, but are involved in the regulation or differentiation of cell growth. They often have protein kinase activity.Proto-Oncogene Proteins c-raf: A ubiquitously expressed raf kinase subclass that plays an important role in SIGNAL TRANSDUCTION. The c-raf Kinases are MAP kinase kinase kinases that have specificity for MAP KINASE KINASE 1 and MAP KINASE KINASE 2.Proto-Oncogenes: Normal cellular genes homologous to viral oncogenes. The products of proto-oncogenes are important regulators of biological processes and appear to be involved in the events that serve to maintain the ordered procession through the cell cycle. Proto-oncogenes have names of the form c-onc.Proto-Oncogene Proteins c-ret: Receptor protein-tyrosine kinases involved in the signaling of GLIAL CELL-LINE DERIVED NEUROTROPHIC FACTOR ligands. They contain an extracellular cadherin domain and form a receptor complexes with GDNF RECEPTORS. Mutations in ret protein are responsible for HIRSCHSPRUNG DISEASE and MULTIPLE ENDOCRINE NEOPLASIA TYPE 2.Proto-Oncogene Proteins c-fes: Proto-oncogene proteins fes are protein-tyrosine kinases with a central SH2 DOMAIN. It has been implicated in SIGNAL TRANSDUCTION PATHWAYS for CELL DIFFERENTIATION of a variety of cell types including MYELOID PROGENITOR CELLS. Fes proto-oncogene proteins also bind TUBULIN and promote MICROTUBULE assembly.