Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Membranous nephropathy ?
    ### Response:
    Membranous nephropathy is a kidney disease characterized by inflammation of the structures inside the kidney that help filter wastes and fluids. When the glomerular basement membrane becomes thickened, it does not work normally, allowing large amounts of protein to be lost in the urine.
    