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 design response or capacity to respond to photoperiod, a recurring cycle of light and dark periods of constant length. Garden design, and the Islamic garden tradition, began with creating the Paradise garden in Ancient Persia, in Western Asia. It evolved over the centuries, and in the different cultures Islamic dynasties came to rule in Central— South Asia, the Near East, North Africa, and the Iberian Peninsula. Some styles and examples include: Garden design history and precedents from the Mediterranean region include: A formal garden in the Persian garden and European garden design traditions is rectilinear and axial in design. The equally