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
Garden centre UK counterparts. Many US garden centers have other departments including wild bird feeding, floral, gift, outdoor furniture and barbecue grills, home decor, landscape design, landscaping services and pet supplies. Most garden centers have a large Christmas department during the holiday season. Some garden centres have added a cafe or coffee bar, but not like the restaurants found in some European garden centres. Both of the largest home improvement stores in the US—Lowe's and The Home Depot—refer to their gardening departments as garden centers. Greenhouses are commonly part of a US garden center. Greenhouses protect the plants from late cold snaps,