Bone marrow biopsy in HCL: reticulin stain. This figure (biopsy with reticulin stain) was stained using reagents according to the manufacturer's instructions (Ventana Medical Systems). The image was obtained using an UPlanFL 40× Olympus objective. The microscope used was an Olympus BX50 (Olympus America). The image was collected using an MTI 3 CCD camera (DAGE-MTI Inc) with PAX-it 2.0 acquisition software (MIS).