Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes EEC syndrome ?
    ### Response:
    What causes EEC syndrome? Approximately 90% of individuals with EEC syndrome have a causative mutation identified in the TP63 gene. The TP63 gene codes for the p63 protein, which plays a critical role in early development of the ectoderm-the layers of tissue that develop into the skin, hair, teeth, and nails.
    