您要查找的是不是：
- fraction Ⅰ protein蛋白质部分Ⅰ, 蛋白质片段Ⅰ
- pre-sperm fraction (猪)无精子部的精液
- fraction Ⅰ, Ⅱ, Ⅲ of γ-globulin丙种球蛋白的Ⅰ、Ⅱ、Ⅲ组分
- (=quick fraction) (膜电位)快速段，快速部分Q fract.
- 因此近年来有关学者对从卡介苗中提取低毒高效成分产生了极大兴趣，如卡介苗的细胞壁骨架（Cell-Wall Skeleton from BCG, BCG-CWS）、多糖（Polysaccharide Nucleic Acid Fraction from BCG, BCG-PSN）等。Therefore, many researchers are interested in separating active components with low toxicity from BCG, such as Cell-Wall Skeleton from BCG(BCG-CWS), Polysaccharide Nucleic Acid Fraction from BCG(BCG-PSN), etc.
