It shows that the spleen stores huge numbers of white blood cells called monocytes.

VOA: special.2009.08.25

Some of them have the capability of becoming white blood cells, or leukocytes, of which there are many different subsets.

一些能够成为白细胞,或称白血球,白细胞又分很多的亚类

耶鲁公开课 - 生物医学工程探索课程节选

They examined DNA-methylation in the white blood cells.

VOA: special.2009.11.24

from their album "White Blood Cells."

VOA: special.2009.11.09