Kinase Family RCK
Both subfamilies are found throughout eukaryotes, though MOK is lost in several lineages that have also lost cilia.
All RCK kinases have an N-terminal kinase domain and a variable length (~100-300 AA) C-terminal tail without any known domains. Almost all RCK kinases have a T[DE]Y motif in their activation loop, similar to MAPK, and require both the T and Y to be phosphorylated for complete function.
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The family is named RCK after the mouse gene rck, the ortholog of human MAK. It was defined in the 2002 human kinome paper .