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| + | == www.amassdenver.com Some animals ‘see’ the world == | ||
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| + | of spines shading the urchin surface, but they didn’t prove that’s what makes the vision work. “Figuring it out from there gets a little tougher,<a href=" " target="_blank">cheap retro jordans< a>,” Johnsen says. “You have to do something gruesome like take the little spines off and the urchins sort of like — die.”< p><h4><strong>Opsins everywhere< strong>< h4><p>Then advances in automated genetic analysis led to a rush of discoveries of opsin molecules that told a twistier urchin story,<a href=" " target="_blank">cheap jordans online< a>.< p><p>Opsins are the proteins that make animal eyes possible. People also have other light-sensing molecules, such as the crypto-chromes that surge and fade to keep the body’s day-night rhythms. But opsins are the celebrity molecules that let photoreceptors in the retinas of humans and other animals see.< p><p>The various opsins lie embedded in cell membranes and share the basic structure of a cluster of seven dangling curlicues. A naked opsin isn’t of much use for vision, but its superpower is the ability to maintain a connection with a catcher’s mitt of a molecule called a chromophore. The mitt absorbs a photon of light and unkinks itself into a longer, straighter form. That shape change triggers the attached opsin to change shape too, which sets off the biochemical cascade that ends up with a brain seeing,<a href=" " target="_blank">cheap air jordans< a>, say, a carrot in all its orangeness. In humans and most other animals, chromophores are forms of retinal, derived from vitamin A, abundant in those showy carrots.< p><p>Thanks to DNA studies, the growth in sheer numbers of opsin forms being<ul> | ||
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