The protein present in the finger nail is Keratin. Keratin is a tough, fibrous protein that forms the structural component of hair, nails, and the outer layer of skin. It provides strength and protection to these tissues.

Option 1, Actin, is a protein that is primarily found in muscle cells and is involved in muscle contractions. It is not found in high amounts in the finger nails.

Option 2, Myosin, is another protein found in muscle cells that works together with actin to produce muscle contractions. It is not present in significant amounts in the finger nails.

Option 3, Globin, is the protein component of hemoglobin, which is responsible for carrying oxygen in red blood cells. It is not found in the finger nails.

Therefore, the correct answer is 4, Keratin.