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There is nothing out of the ordinary with the Merkel cell, as it functions in the same way as photoreceptors and hair cells (see Further Reading #1). Fig. 1. Merkel cell. Source: Gallery for Share. The Merkel cell depicted in Fig. 1 is a specialized receptor neuron. It has no axon. It relies on a secondary sensory neuron (a somatosensory afferent) onto ...


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Short answer Tar deposition is the cause of the yellow cigarette stains. Background Both tar and nicotine cause yellow to brown staining. Although nicotine itself is colorless/white, it turns yellow upon exposure to air. In a study on cigarette stains, the author speaks of tobacco-tar stains, implicitly acknowledging it is tar and not nicotine (John et ...


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Pure nicotine is a yellow colored liquid (although some sources say it's a clear liquid.) "Tar" is a complex sludge that is also yellow-brown. So it's difficult to distinguish 'nicotine stain' from a 'tar stain' based on visual inspection. Let's go to other considerations. The concept of a 'stain' implies that simple hand washing doesn't remove the ...



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