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Category: Science

What is Anaphylaxis?

Anaphylaxis is a severe allergic reaction that can be life-threatening. It occurs when the body’s immune system overreacts to a substance that it is allergic to, such as food, medication, or insect venom. Symptoms of...

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What is PPD?

Para-phenylenediamine, or PPD, is a chemical compound with the formula C6H4(NH2)2. It belongs to the class of compounds known as aromatic amines, which are characterized by a ring of six carbon atoms with one or more amino...

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