And what they found was, even though we had penicillin, those cells did not actually lice. They did not actually die. So if we took bacterial cells and grew them in the presence of penicillin in a hypertonic solution, those cells did not actually die off. So what do we mean by hypertonic environment? So on the outside of the cell, we have a high concentration of solutes. On the inside, we have a low concentration.