Attached Gallery

T lymphocytes and cancer cell, SEM

T lymphocytes and cancer cell. Coloured scanning electron micrograph (SEM) of T lymphocyte cells (green) attached to a cancer cell. T lymphocytes are a type of white blood cell that recognise a specific site (antigen) on the surface of cancer cells or pathogens and bind to it. Some T lymphocytes then signal for other immune system cells to eliminate the cell. The genetic changes that cause a cell to become cancerous lead to the presentation of tumour antigens on the cell's surface. Magnification: x2300 when printed at 10 centimetres wide

© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Dugong, remora and golden trevallies

Dugong (Dugong dugong) with a remora (Echeneis naucrates) attached at its rear and juvenile golden trevallies (Gnathanodon speciosus) swimming in front. The dugong is a herbivorous marine mammal found in shallow, tropical waters throughout the Indo-Pacific region. It can grow to three metres in length and 400 kilograms in weight. Remoras have a symbiotic relationship with large sea animals. They use a sucking disk on the top of their heads to attach to their host. They clean the host's skin of parasites and the host's presence protects the remoras from predators. The golden trevallies swim in front of harmless sea animals to be pushed along by the animal's propulsion. Photographed in the Red Sea, Egypt

© Alexis Rosenfeld/Science Photo Library

Iron jaw act

Unidentified iron jaw act. The performer held one end of a leather strap with their teeth while the other end of the strap had a hook which was attached to a trapeze or, in this case, to a parasol high in the air. The artistes performed acrobatics while hanging from the strap. Date: circa 1920s

© MonoMania Images / Mary Evans Picture Library

1920s, Act, Air, Artistes, Attached, Case, Circa, End, Held, High, Hook, Iron, Jaw, Leather, Parasol, Performer, Strap, Teeth, Trapeze, Unidentified