1.   It has long been known that amphibian skin contains strong chemicals.

2.   Because infected skin contained a proliferation of round cells, rather than fungal filaments, Nichols thought it was a protozoan.

3.   Black skin contains liberal amounts of melanin, a pigment that acts like an internal sunscreen.

4.   Handling photos can damage them because the human skin contains oils that are detrimental to the emulsion and support of a picture.

5.   Skin contains seven different kinds of cells organized into a structure that allows continuous regeneration in three weeks.

6.   White grape juice, the researchers found, had the highest fluoride concentrations, probably because the skins from grapes contained fluoride from pesticides.

7.   Scientists already knew that skin contains germ-fighting substances that go to work after skin injury and during wound healing.

8.   Tyler said frogs were of enormous benefit to humans because their skins contain extractable compounds that fought human disease, including antibacterial, antifungal and antiviral agents.