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Animals that lack CXCR4 and CCR5 proteins are immune to HIV infection.
Synovial Fluid
A viscous, non-Newtonian fluid found in the cavities of synovial joints, serving as a lubricant to reduce friction between the articular cartilages during movement.
Collagen
A key structural protein found in skin, bones, tendons, and other connective tissues, responsible for providing strength and elasticity.
Joint Capsule
A saclike structure surrounding a joint, providing protection and support, containing synovial fluid which lubricates the joint.
Mucous Membrane
A layer of epithelial tissue that lines various cavities in the body and secretes mucus, which is involved in moisture regulation and protection against infection.
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