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
European Day of the Righteous Hons. Gabriele Albertini, Lena Kolarska-Bobinska, Niccolò Rinaldi, and defines the aims of the European day of the Righteous in the following way: The European day of the Righteous was approved by the European Parliament on 10 May 2012 with 388 signatures. The activities related to the Righteous are supported at the international level by Gariwo, the forest of the Righteous, the Garden of the Righteous for the Armenians in Yerevan, the writer, founder of NGO Gariwo Sarajevo and activist for civil courage Svetlana Broz who is struggling to create a Garden of the Righteous in Sarajevo and such figures as