Neu5Gc is a glycoprotein found on the outside of animal cells, composed of protein and carbohydrate, which humans do not naturally have; humans have Neu5Ac instead.

“neu5gc what the heck is this it is a glycoprotein found on the outside of our cells meaning that it is a protein molecule kind of like the glycocalyx on the endothelial cells or on the cells that line our gut it is a glycoprotein molecule which sticks out from so composed of protein and carbohydrate and it belongs to a family of molecules called sciatic acids now humans don't have neu5gc we have new 5ac and other sciatic glycoprotein molecules on ourselves but we don't have new 5g C”