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“Close to the middle of the front of the Euglena is a long skinny whip like structure called the flagellum which comes out of the organ called the mouth.”
“Even single-celled Euglena have light sensing capabilities.”
“A recent paper in Science explains how bacteria with flagella those little whips, think to the might Euglena from your Biology class, or one better, sperm move and stop.”
“Iseki M et al., A blue-light-activated adenylyl cyclase mediates photoavoidance in Euglena gracilis Nature, 2002, 415, 1047-1051”
“The Euglena signal transduction cascade consists of a single protein, the light harvesting protein and the protein that generates the single signaling molecule is one and the same Iseki et al., 2002.”
“One of the iconic light spots is that of the eukaryotic single-celled organism Euglena.”
“The Euglena signal transduction cascade consists of a single protein, the light harvesting protein and the protein that generates the single signaling molecule are one and the same Iseki 2002.”
“Having one photosensitive enzyme is inadequate for modern mammalian vision, but it is quite adequate for a simple photospot such as in Euglena, and subsequent enzymes can be tacked on.”
“As we saw, Euglena has a single-protein system, which is not irreducibly complex at all, and we can see how systems could be tacked on to it to form a cascade.”
“Vertebrates use the molecule opsin, rather than the Euglena protein.”
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