Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) phosphoglycerate kinase deficiency ?
    ### Response:
    Phosphoglycerate kinase deficiency is a genetic disorder that affects the body's ability to break down the simple sugar glucose, which is the primary energy source for most cells. Researchers have described two major forms of the condition. The most common form is sometimes called the hemolytic form.
    