onion epidermis, whole mount, cells of allium cepa, 20x light micrograph

onion epidermis cells cell microscope micrograph photomicrograph layer light light nucleus membrane vacuole cell wall mount cytoplasm large clear allium cepa allium single purple stained 20x plant plant magnified magnification biology microbiology nature microscopy histology cytology anatomy research science microanatomy specimen sample visual microsection slide micro botany education