Immunostaining of pDC-associated markers in tumors derived from these cells and in cutaneous deposits of acute myeloid leukemia (leukemia cutis). The markers shown were expressed by essentially all cases of pDC-derived neoplasms, and the first 4 were expressed only in a minority of leukemia cutis biopsies (BCL11A: 6 of 24 cases; BLNK: 8 of 24 cases; CD2AP: 1 of 24 cases, and ICSBP: 5 of 24 cases). In contrast, BTK was expressed in all samples of leukemia cutis tested (24 of 24 cases; immunoperoxidase staining, hematoxylin counterstain). (Images were acquired on a Nikon Eclipse E800 microscope [Nikon, Tokyo, Japan] equipped with 20×/0.7, 40×/0.95, and 60×/1.4 Plan Fluor objective lenses [Zeiss], using a Zeiss Axiocam digital camera [Zeiss, Oberkochen, Germany], Axiovision 3 image acquisition software [Zeiss], and Adobe Photoshop 7 image processing and manipulation software [Adobe, San Jose, CA].)