Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Kuskokwim syndrome ?
    ### Response:
    Kuskokwim syndrome is characterized by joint deformities called contractures that restrict the movement of affected joints. This condition has been found only in a population of native Alaskans known as Yup'ik Eskimos, who live in and around a region of southwest Alaska known as the Kuskokwim River Delta.
    