Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Treacher Collins syndrome ?
    ### Response:
    What are the signs and symptoms of Treacher Collins syndrome? The signs and symptoms of Treacher Collins syndrome vary greatly, ranging from almost unnoticeable to severe. Most affected people have underdeveloped facial bones, particularly the cheek bones, and a very small jaw and chin (micrognathia).
    