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RYK (Receptor like Tyrosine kinase 1) is in the Tyrosine family of receptor kinases. It is found in the plasma membrane of heart, prostate and kidney cells. RYK contains 604 amino acids and it contains one WIF domain. It functions as a potential growth factor receptor protein tyrosine kinase. RYK are divergent from those of other classic receptor tyrosine kinases. It is an orphan receptor that contains a catalytically inactive tyrosine kinase related domain. RYK is expressed in nestin positive progenitor cells and neurons, and in a certain population of oligodendrocytes, O2A progenitor cells, and type 2 astrocytes in developing CNS.