Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Neurofibromatosis type 1 ?
    ### Response:
    Neurofibromatosis type 1 (NF1) is a rare, inherited condition that is characterized primarily by changes in skin coloring and the development of multiple benign tumors along the nerves of the skin, brain, and other parts of the body. The severity of the condition and the associated signs and symptoms vary significantly from person to person.
    