The various types of cells making up the structural composition of your body (skin cells, muscle cells, cells of your stomach lining, etc.) are all Epithelial cells. The only other class of cells in your body are Gametes (sperm and egg cells).
        
             
        
        
        
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Three forms are deletion, insertion, and frame-shaft. They occur during protein synthesis, specifically transcription, when the tRNA is being coded into amino acids.