purified protein derivative of tuberculin

例句：

1. 1. Thepurified protein derivative of tuberculin isa key component in the treatment of tuberculosis.
   结核疫苗的纯化蛋白衍生物是治疗结核病的关键成分。
2. 2. Thepurified protein derivative of tuberculin hasbeen shown to have anti-tuberculosis activity.
   结核疫苗的纯化蛋白衍生物已被证明具有抗结核活性。
3. 3.The purified protein derivative of tuberculinis used as a vaccine for preventing tuberculosis.
   结核疫苗的纯化蛋白衍生物被用作预防结核病的疫苗。