What is the protein that reduces water loss at the skin surface?

Keratin.

Explanation:

Keratin protein is present in hair, hooves, nails and skin. keratin is a class of the fibrous structural protein that protects the skin from damage.

Keratin protein reduces the water loss at the skin surface. The keratin is insoluble in water and cannot be dissolved in organic solvents also. Keratin also protect the skin from the stress.

Thus, the answer is keratin.

Chemotherapy works by stopping or slowing the growth of cancer cells, which grow and divide quickly. It can also harm healthy cells that divide quickly, such as those that line your mouth and intestines or cause your hair to grow. Damage to healthy cells may cause side effects. Chemotherapy kills cells that are in the process of splitting into 2 new cells. Because cancer cells divide much more often than most normal cells, chemotherapy is much more likely to kill them. Some drugs kill dividing cells by damaging the part of the cell's control centre that makes it divide.