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.
Introduction. Lips can become chapped or dry when they are exposed to the sun, wind, and cold or dry air. A lip balm containing petroleum or beeswax will provide a barrier and help seal in moisture. More moisture is lost through the lips than through any other part of the face or body.