Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) 15q13.3 microdeletion ?
    ### Response:
    15q13.3 microdeletion is a chromosomal change in which a small piece of chromosome 15 is deleted in each cell. The deletion occurs on the long (q) arm of the chromosome at a position designated q13.3. This chromosomal change increases the risk of intellectual disability, seizures, behavioral problems, and psychiatric disorders.
    