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.
Use lip balm. Apply a lip balm to promote healing and prevent chapped lips. Lip balm also helps to seal in moisture and protect your lips from outside irritations. Apply lip balm every hour or two to treat dry lips and to keep them healthy. Use balm with SPF of at least 16 to save your lips from sun damage. Apply lip balm after you have applied a moisturizer.