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@. Blood Serum vs Blood Plasma
@. Myelinated vs Unmyelinated Neurons
@. Sympathetic vs Parasympathetic Nervous System
@. Compact Bone vs Spongy Bone (Cortical vs Cancellous Bone)
@. A-Band vs I-Band of Muscle Fibres (Sarcomere)
@. Primary Myofilaments vs Secondary Myofilaments