human hematopoietic target-cell lines known to be lysable in short-term 51cr-release assays by natural killer ( nk ) cells occurring in spleens of normal , nonimmune cba/j and a/j mice were adapted to grow in culture medium supplemented with human ab serum or with normal mouse serum ( nms ) .
C0018957
hematopoietic
C0037993
spleens