The Drosophila ovary is an excellent model system for studies of organogenesis. Here the whole Drosophila ovary is spread out on a slide. Germline and somatic stem cells are at the outside tip of each ovariole strand while the mature eggs are in the center.
Staphylococcus bacteria. Coloured scanning electr- on micrograph (SEM) of Staphylococcus aureus bacteria (yellow) on human nasal epithelial cells. These gram-positive cocci (spherical bacteria) are adhering to mucus (blue) on the hair-like cilia which protrude from the epithelial cells. S. aureus is very common in humans, living harmlessly on the skin and in the nose, throat and large intestine. Science is Everything (Staphylococcus bacteria. Coloured scanning electr-...)