Become a Certified Fairyologist! In Doreen Virtue's exciting and entertaining new video course, you'll learn all about the fairies, including their history, lineage, myths, multi-cultural aspects, other elementals, and how to connect with and receive messages from fairies, including how to see and photograph fairies.
Endogenous vs Exogenous Antigens. Any molecule or substance that reacts to a product of a specific immune response and stimulates antibody generation is considered as an antigen.The antibody generation by an antigen is called antigenicity of that particular molecule.Antigens can be either a protein or a polysaccharide.he vast majority of antigens are exogenous antigens. They are introduced into the body from outside via various infections agents such as bacteria, viruses, fungi, protozoa, helminthes etc., or environmental substances such as dust mites, foodstuff, pollen etc. by inhalation, ingestion, or injection.
Exogenous DNA refers to any deoxyribonucleic acid that originates outside of the organism of concern or study. The introduction of exogenous DNA into a cell is called transformation (transfection in animal cells).ransformation is a naturally occurring process in bacteria. Bacteria need to be in a certain physiological state to successfully take up exogenous DNA, which is described as one of competence. Some bacteria are naturally competent, but usually only for a brief time at a certain stage of their growth cycle.