GLUT1 immunostaining. a, b. Reactive germinal centers showing membrane bound GLUT1 expression in follicular dendritic cells. c. GLUT1 expression in the enlarged mantle zone of a progressively transformed germinal center. d. NSCHL with membrane bound GLUT1 expression by the HRS cells. e. NSCHL with granular cytoplasmic expression of GLUT1 by the HRS cells. f. NLPHL with GLUT1 expression in the reactive B cells, but no GLUT1 expression in the LP cells.