Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hanhart syndrome ?
    ### Response:
    Hanhart syndrome is a rare condition that primarily affects the craniofacial region and the limbs (arms and legs). People affected by this condition are often born with a short, incompletely developed tongue; absent or partially missing fingers and/or toes; abnormalities of the arms and/or legs; and an extremely small jaw.
    