sweat gland. secretory unit. mallory ptah stain

biological biology cell cytological cytology dermis duct eccrine epidermis epithelial epithelium excretory gland glands hematoxylineosin histological histology human hypodermis mallory micrograph microscope microscopic microscopy myoepithelial paraffin phosphotungstic photomicrograph section skin stain sudor sudoripares sweat tissue