Spider are apparently absent. In some species, the exocuticle of the legs and prosoma is modified by a tanning process, resulting in brown coloration. Bilins are found, for example, in "Micrommata virescens", resulting in its green color. Guanine is responsible for the white markings of the European garden spider "Araneus diadematus". It is in many species accumulated in specialized cells called guanocytes. In genera such as "Tetragnatha", "Leucauge", "Argyrodes" or "Theridiosoma", guanine creates their silvery appearance. While guanine is originally an end-product of protein metabolism, its excretion can be blocked in spiders, leading to an increase in its storage. Structural colors
The Quiet Garden Trust parts of the world, not only in European countries such as the United Kingdom, Ireland, France, Belgium, Finland, Austria, Switzerland and Cyprus, but also in Australia, New Zealand, South Africa, Botswana, Kenya, Uganda, Brazil, Haiti, Canada and the USA. The gardens vary widely in size, location and character. Most cater for a broad public, but some were created to serve a particular community, such as the Quiet Garden on the edge of the Nsambya Hospital in Kampala, Uganda for AIDS patients and carers. Polesworth Abbey in Warwickshire has created a sensory garden with fragrant herbal plants, designed in consultation with