DNA. complementary DNA (cDNA), copy DNA DNA transcribed from a specific RNA through the action of the enzyme reverse transcriptase. mitochondrial DNA (mtDNA) the DNA of the mitochondrial chromosome, existing in several thousand copies per cell and inherited exclusively from the mother.
Castor Oil. Castor oil is another good treatment for dry and chapped lips. Simply apply castor oil to your lips several times a day. You can also make a soothing treatment using one teaspoon of castor oil, one teaspoon of glycerin and a few drops of fresh lemon juice.
Chapped lips: Chapped lips are caused by dryness of the lips. Part of the underlying problem may be that you need to drink more water or fluids. Other than that, you will need to use something that will keep the lips moist. This could be as simple as vaseline or lip balm, medicated or not.