1. The skin is the organ that separates our body from the environment and therefore from foreign antigens, thus the skin not only acts as a physical barrier but it also acts as an immunological barrier. Keratinocytes are the primary cells found in the skin epidermis. These cells contain genes that code for cytokines and when the cells are triggered the genes become activated and mRNA transcripts are produced. 

Explain why the mRNA transcripts leaving the nucleus have fewer nucleotides than the RNA initially produced by DNA transcription.