Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Myofibrillar myopathy ?
    ### Response:
    What are the signs and symptoms of Myofibrillar myopathy? Myofibrillar myopathy (MFM) primarily affects skeletal muscles, which are muscles that the body uses for movement. In some cases, the heart (cardiac) muscle is also affected. The signs and symptoms of MFM vary widely among affected individuals, typically depending on the condition's genetic cause.
    