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.
Another simple and natural solution for chapped lips is cucumber. Rub a small slice of cucumber across your dry lips gently so that the juice is applied well over them. Leave it on for 15 to 20 minutes and then wash your lips with water. Do this several times a day to help your lips heal faster. 9. Petroleum Jelly