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Key complement components C3b, iC3b, and C4b are generated as by-products of the classical pathway of complement activation. C3b-coated particles in the blood mainly bind to red blood cells, which have the receptor CR1 that binds C3b.
Liposomes are small artificial vesicles of spherical shape that can be created from cholesterol and natural non-toxic phospholipids. Due to their size and hydrophobic and hydrophilic character(besides biocompatibility), liposomes are promising systems for drug delivery.