<prompt> JAK -2 mutation is seen in?Polycythemia VeraI.T.PC.M.LC.M.M.L  <response>: Ans. a Polycyathemia VeraRef: Robbins pathology 9th ed616JAK-2 Mutation is seen in:- Polycythemia Vera Primary myelofibrosis Essential Thrombocytosis 