HAS 1-3 immunoreactivity and HA-staining in normal and neoplastic human endometrium. Immunostaining of HAS1 (A, B), HAS2 (C, D), HAS3 (E, F) and HA (G, H) in normal human endometrium (A, C, E, G) and in grade 2 endometrioid endometrial carcinoma tissue sections (B, D, F, H). The brown color (DAB) indicates HAS (A-F) or HA (G, H), and blue color (haematoxylin) indicates nuclei. A-F: 200× original magnification. G, H: 100× original magnification.