And so each one of these sections, each one of these individual bands can consist of two or more proteins, but it also can consist of only a single protein. To basically determine if we have more proteins in each one of these sections, we have to carry out some other type of purification process that separates the proteins based on some other type of property. So in the second method, the horizontal gel lane that contains the protein, so this entire gel lane is placed onto the SDS Page apparatus. So SDS polyacrylamide gel electrophoresis apparatus, the proteins now begin to move as a result of that electric field in the perpendicular direction with respect to the direction in this case. So here we have along the x axis, and here we have movement along the y axis. So the x axis is perpendicular to the y axis, so they begin to move downward.