B cell growth factor

例句：

1. 1. This protein is essential for the growth of B cells.
   这种蛋白质对于B细胞的生长至关重要。
2. 2. The researcher found that this growth factor could enhance the immune response.
   研究者发现，这个生长因子可以增强免疫反应。
3. 3. In some diseases, the B cell growth factor levels are elevated, indicating an active immune response.
   在一些疾病中，B细胞生长因子的水平升高，表明免疫系统活跃。