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
Summer Garden the sculptures were no longer extant, and those remaining were moved from place to place, thus destroying the original design. In late 20th century, all sculptures were rearranged and today they stand in accordance with the aesthetic ideas charactertistic of the beginning of the 18th century. The Summer Garden Park is widely considered by many to be one of the most romantic, evocative and beautiful places in St Petersburg. Summer Garden The Summer Garden (, "Letniy sad") occupies an island between the Fontanka, Moika, and the Swan Canal in Saint Petersburg, Russia and shares its name with the adjacent Summer