So this is our initial beaker. In that initial beaker, we have that sample. So we take a pipette, we extract a small amount from that beaker, and we essentially drop that into this well. And this is essentially step A. So in Step A, we expose the original homogeneous mixture to the SDS Page setup and we get the following distribution of bands. So this is step A, and for step A, these are the different types of bands.