Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Russell-Silver syndrome ?
    ### Response:
    What causes Russell-Silver syndrome? Russell-Silver syndrome (RSS) is a genetic disorder that usually results from the abnormal regulation of certain genes that control growth. Two genetic causes have been found to result in the majority of cases: abnormalities at an imprinted region on chromosome 11p15 - for some genes, only the copy inherited from a person's father (paternal copy) or mother (maternal copy) is "turned on," or expressed.
    