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Cilia are slender, microscopic, hair-like structures or organelles that extend from the surface of nearly all mammalian cells (multiple or single). They are primordial. The ciliary apparatus is connected to cell cycle progression and proliferation, and cilia play a vital part in human and animal development and in everyday life.
Copulas are tools for modelling dependence of several random variables. The term copula was rst used in the work of Sklar (1959) and is derived from the latin word copulare, to connect or to join. The main purpose of copulas is to describe the interrelation of several random variables. The outline of this chapter is as follows: as a starting point we explore a small example trying to grasp an idea about the problem.