Dozens of cell types have specialized in encoding the visual world

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Dozens of cell types have specialized in encoding the visual world

The retina encodes the visual world. In the complex architecture of multicellular organisms, most normal cells take their rightful place. They are anchored to a network of membranes and connective tissue, A subjective sensation of the shapes, Colors and movements that surround the observer. However, The retina is not a mere repository of Dozens Specialized photocells. This thin sheet of nervous tissue at the back of the eye constitutes an extension of the central nervous system. Its circuits of neurons, Perform a kind of visual image analysis. Certain features are accentuated and others are mitigated. Neurobiologists have endeavored to reveal how light signals are transformed into nerve activity and how that activity is modified. In the first place, The encoding character of the retina was demonstrated.

Functional architecture of the retina

In a living cell, the nucleic acids DNA and RNA contain the information necessary for metabolism and reproduction. Proteins are functional molecules: In their enzymatic action they catalyze all the chemical reactions on which cellular metabolism is based. Until very recently these categories were thought to be exclusive. The truth is that the division of cellular work between molecules that carry information and catalytic molecules has constituted one of the basic Apparel & Garments business email list principles of biochemistry. However, in recent years, this simple scheme has been disrupted by the discovery that an RNA could exert enzymatic functions. The first example of an RNA with catalytic activity was discovered in 1981 and 1982 by our working group when they were studying an RNA from the protozoan. To our surprise we observed that this RNA could catalyze the splicing reactions that led to the removal of part of the RNA.

RNA enzymatic function

If we were allowed to overlook that it is not a protein, RNA would come very close to the definition of an enzyme. The enzymes also act on other proteins, But not on themselves, as does the RNA of. That is why we created a new term for enzyme-like RNA: “Ribozyme.” Recently, However, We found that a slightly different form of the same RNA catalyzed the Sale Lead synthesis of RNAs other than itself, Making it an enzyme in every sense of the word. That is, The way in which the visual image, Related to the signal it transmits. In the early 1970s the fundamental features of the encoding process were unraveled. The presence, In the retina, Of five main classes of neurons, Connected to each other through synapses, Was already known. Areas of narrow apposition where a neuron releases chemical messengers, Called neurotransmitters.

Dozens of cell types have specialized in encoding the visual world

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