Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) protein C deficiency ?
    ### Response:
    Protein C deficiency is a disorder that increases the risk of developing abnormal blood clots; the condition can be mild or severe.  Individuals with mild protein C deficiency are at risk of a type of blood clot known as a deep vein thrombosis (DVT). These clots occur in the deep veins of the arms or legs, away from the surface of the skin.
    