Figure 1. Pathology immunohistochemical staining of bone marrow (a) and lymph node (b) demonstrating increased expression of PAX5 in the marrow sample significant for B-cell blast (CD34+) population versus no expression of PAX5 in lymph node sample despite presence of blast cells (CD34+) suggesting biphenotypic expression of the cell lines. Row a1: bone marrow, a2: bone marrow with CD34-positive expression, a3: bone marrow with significant expression of PAX5; Row b1: lymph node, b2: lymph node with positive CD34 expression, b3: lymph node without expression of PAX5.