When an antigen is bound to a class i mhc molecule?

When that situation happens then it can stimulate a cytotoxic T cell. This types of cells are the ones directly responsible for cellular immunity. Cytotoxic T cells can attack target cells by secreting a cytokine that triggers apoptosis which is the death of cells which occurs as a normal and controlled part of an organism's growth or development.

Proteins vitamins and a carbohydrate is a atom