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" Skin is made in large measure of a protein called collagen. "

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" In order to say that some function is understood, every relevant step in the process must be elucidated. "

" It is often said that science must avoid any conclusions which smack of the supernatural. "

" It was only about sixty years ago that the expansion of the universe was first observed. "

" As can be seen even by this limited number of examples proteins carry out amazingly diverse functions. "

" The question of how the eye works - that is, what happens when a photon of light first impinges on the retina - simply could not be answered at that time. "

" By irreducibly complex I mean a single system composed of several well-matched, interacting parts that contribute to the basic function, wherein the removal of any one of the parts causes the system to effectively cease functioning. "

" This fact immediately suggested a singular event - that at some time in the distant past the universe began expanding from an extremely small size. To many people this inference was loaded with overtones of a supernatural event - the creation, the beginning of the universe. "

" It was a shock to people of the nineteenth century when they discovered, from observations science had made, that many features of the biological world could be ascribed to the elegant principle of natural selection. "

" Science is not a game in which arbitrary rules are used to decide what explanations are to be permitted. "

" In many biological structures proteins are simply components of larger molecular machines. "

" It is a shock to us in the twentieth century to discover, from observations science has made, that the fundamental mechanisms of life cannot be ascribed to natural selection, and therefore were designed. But we must deal with our shock as best we can and go on. "

" But sequence comparisons simply can't account for the development of complex biochemical systems any more than Darwin's comparison of simple and complex eyes told him how vision worked. "

" Since natural selection requires a function to select, an irreducibly complex biological system, if there is such a thing, would have to arise as an integrated unit for natural selection to have anything to act on. "

" The point here is that physics followed the data where it seemed to lead, even though some thought the model gave aid and comfort to religion. "

" Throughout history there have been many other examples, similar to that of Haeckel, Huxley and the cell, where a key piece of a particular scientific puzzle was beyond the understanding of the age. "

" Thus it seemed to Haeckel that such simple life could easily be produced from inanimate material. "

" Although Darwin was able to persuade much of the world that a modern eye could be produced gradually from a much simpler structure, he did not even attempt to explain how the simple light sensitive spot that was his starting point actually worked. "

" The theory of undirected evolution is already dead, but the work of science continues. "

" A man from a primitive culture who sees an automobile might guess that it was powered by the wind or by an antelope hidden under the car, but when he opens up the hood and sees the engine he immediately realizes that it was designed. "

" In Darwin's time all of biology was a black box: not only the cell, or the eye, or digestion, or immunity, but every biological structure and function because, ultimately, no one could explain how biological processes occurred. "

" In the 19th century the anatomy of the eye was known in great detail and the sophisticated mechanisms it employs to deliver an accurate picture of the outside world astounded everyone who was familiar with them. "

" We are not inferring design to account for a black box, but to account for an open box. "

" Biology has progressed tremendously due to the model that Darwin put forth. But the black boxes Darwin accepted are now being opened, and our view of the world is again being shaken. "

" The basic structure of proteins is quite simple: they are formed by hooking together in a chain discrete subunits called amino acids. "