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.
1 Lip balms â if your lips are chapped, dry, and swollen you can keep your lips moist at all times by applying lip balms to your lips, both upper and lower. 2  Lip balms can also protect your lips from the sun. 3  Monitor your diet â this is especially true if the swelling is caused by a certain food.