Table 2. Detection of human B cells in organs of NOD/SCID mice via immunohistochemistry.

Human B cells (CD20, CD79a)	Bone marrow	Spleen
PBS control	−	−
CLL Low-risk	−	++
CLL High-risk	+	+
Healthy control	+	+

Exemplary analysis. - negative; + only single cells are positive; ++ more than one cell per high power field.