Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Nonspherocytic hemolytic anemia due to hexokinase deficiency ?
    ### Response:
    Nonspherocytic hemolytic anemia due to hexokinase deficiency (NSHA due to HK1 deficiency) is a very rare condition mainly characterized by severe, chronic hemolysis, beginning in infancy. Approximately 20 cases of this condition have been described to date.
    