Administration of free and to a greater extent immobilized terrilytin to intact animals significantly enhanced the proliferative activity of hepatocytes and cells of the eye cornea under normal conditions, during physical loading and vibration. At administration of preparations of proteases splenocytes release two protein functionally different substances--a low molecular one exerting the immunostimulating effect and a relatively high molecular one enhancing the proliferative activity of nonimmunocompetent cells (hepatocytes and epitheliocytes of the cornea). The results of the studies indicate the presence of a close relationship between the immunological and nonimmunological effects caused by proteolytic enzymes.