Describe the role of free radicals in lipid peroxidation.

Free radicals play a significant role in the process of lipid peroxidation, a chain reaction that involves the oxidative degradation of lipids (fats) in cell membranes. Lipid peroxidation can have detrimental effects on cellular structures and functions, leading to various pathological conditions and contributing to the development of chronic diseases. Here's how free radicals participate in the process of lipid peroxidation:

1. Initiation: The process of lipid peroxidation begins with the initiation step, which involves the interaction of a free radical with a polyunsaturated fatty acid (PUFA) molecule in a cell membrane. PUFA molecules are ____ ____ ___ _______ __________ __________ ___ ___ ____.
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