Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) combined malonic and methylmalonic aciduria ?
    ### Response:
    Combined malonic and methylmalonic aciduria (CMAMMA) is a condition characterized by high levels of certain chemicals, known as malonic acid and methylmalonic acid, in the body. A distinguishing feature of this condition is higher levels of methylmalonic acid than malonic acid in the urine, although both are elevated.
    