Glycoprotein and Glycosylation

Our body has the ability to distinguish our own cells from those cells that are not belong to our body cells.

Glycoprotein acts as a marker for the cell so our body knows that this cell is our body cell and not enemy. Example: bacteria, virus, pollen.

It is impossible for two people having the same glycoprotein contents except identical twins.

The immune system will not respond to 'self cell' but react with those cells are 'non-self'.