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.
An oil can be mixed and applied to chapped lips to help ease the pain, and to assist in healing, and is formulated as follows: 1  20 ml Aloe vera oil. 2  1 drop Chamomile oil. 3  2 drops Geranium oil.  1 drop Neroli 1  oil. 2 drops Rose  oil.