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, or cracked, lips is the term commonly used to describe dry lips. Chapped lips can be caused by a number of factors, including the weather, excessive licking of the lips, and certain medications. Chapped lips is a very common condition that occurs only on occasion for most people. However, some may develop a more severe form of chapped lips called cheilitis.