Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) prothrombin deficiency ?
    ### Response:
    Prothrombin deficiency is a bleeding disorder that slows the blood clotting process. People with this condition often experience prolonged bleeding following an injury, surgery, or having a tooth pulled. In severe cases of prothrombin deficiency, heavy bleeding occurs after minor trauma or even in the absence of injury (spontaneous bleeding).
    