Diagram from Life Technologies Site:
The Life Technologies diagram is referring to the antibody structure of papain. Papain is one of two unique primary enzymes found in the papaya leaf. Notice the binding to macrophages… These can be thought of as the "trash collection" at the cellular level.
This company is a major player in the Pharma industry and takes room to make note of the special antibody binding of papain.
In an earlier blog on this site a study is reviewed that tested papaya leaf and its potential as an antibiotic for six potent human diseases.
The Julia Ruffin Project researches, grows and promotes papaya leaf tea.