​What is Pathology - What are some of the most common opsonins?

​What is Pathology - What are some of the most common opsonins? 
Opsonins are proteins that are generally found in plasma and interstitial fluids, but they can also develop unintentionally in reaction to injury. The most important opsonins are:
 -Collectins, such as mannose binding protein, which act as natural lectins 
-Immunoglobulin G (IgG) 
-C3b fragment generated after complement cascade activation (carbohydrate-binding proteins)