There are 4 vials containing an equal amount of human cells; each vial has a different type of cell: vial 1 has lymphocytes, vial 2 has erythrocytes, vial 3 has neurons, and vial 4 has muscle cells. Then, for each vial, a DNA extraction protocol is followed. SYBR green dye is then mixed in with the solutions obtained from DNA extraction, and if it does not bind to DNA, it will have a very low fluorescence when excited. If SYBR green has bound to DNA, it will fluoresce more upon excitation. Based on the outcomes of the experiment, which of the following types of cells does NOT belong?