So, if you were to bite a lime after eating a miracle berry, your sweet receptors would fire, making you perceive a sweet taste rather than a sour taste. In this way, miraculin in the miracle berry rewires the sweet receptors to identify acids as sugars instead. Because miraculin in the magic fruit changes shape when exposed to acids, it causes corresponding changes in the way the receptors on our tongue respond to these acids. However, Miraculin binds strongly to the receptors found on the human tongue. So if you were to bite a lime, for example, your sour receptors would begin firing, signaling that the flavor you are detecting is sour. These receptors help us discriminate between sweet, sour, bitter and savory tastes. Every person has several different types of receptors on their taste buds. It is important to first understand how our taste buds respond under normal conditions before understanding how miracle berries work. But how does this protein change taste buds and make everything sweet? Due to the magic berry’s ability to completely alter the flavor of foods, the protein was appropriately named Miraculin. Scientists have isolated the protein in the magic berry responsible for this extraordinary effect.
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