1 If you have lichen planus of the skin that's causing itchiness, antihistamines may be prescribed to help reduce this. 2  Light treatment â there are two types of light treatment: ultraviolet B (UVB) and psoralen plus ultraviolet A (PUVA).
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DNA helicase is the enzyme that unwinds the DNA double helix by breaking the hydrogen bonds down the center of the strand. It begins at a site called the origin of replication, and it creates a replication fork by separating the two sides of the parental DNA. This 'unzipping' of the molecules will expose the nitrogenous bases of the nucleic acid chain so that new nucleotides can be added to create the daughter strand.