Single slice confocal images representing one optical slice of a cell stained for the Human Protein Atlas (HPA) antibody HPA028656 (shown in green). HPA028656 is a polyclonal anti-SYYY antibody that labels the endoplasmic reticulum. The cells are also stained with a reference marker in order to facilitate the annotation of the subcellular distribution of the protein targeted by the HPA antibody. The following probe/organelle was used as reference; DAPI for the nucleus (blue).