Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Familial juvenile hyperuricaemic nephropathy ?
    ### Response:
    Familial juvenile hyperuricaemic nephropathy (FJHN) is an inherited condition that affects the kidneys. The signs and symptoms vary, even among members of the same family. Many individuals with this condition develop high blood levels of a waste product called uric acid.
    