Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) glucose-6-phosphate dehydrogenase deficiency ?
    ### Response:
    Glucose-6-phosphate dehydrogenase deficiency is a genetic disorder that occurs most often in males. This condition mainly affects red blood cells, which carry oxygen from the lungs to tissues throughout the body. In affected individuals, a defect in an enzyme called glucose-6-phosphate dehydrogenase causes red blood cells to break down prematurely.
    