RNA-seq and ribosome profiling experiments have been carried out on the same cells. The following simplified graphs show the results for the same genomic region containing a gene with three exons. Which graph (1 or 2) do you think corresponds to the RNA-seq results? What feature is represented by the arrow? 
Definitions:
Simple Squamous Epithelium
A single layer of flat, scale-like cells that line organs and body cavities, allowing for easy diffusion or filtration due to their thinness.
Alveoli
Tiny air sacs within the lungs where gas exchange occurs, allowing oxygen to enter the bloodstream and carbon dioxide to be expelled during respiration.
Blood
A body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to cells and transports metabolic waste products away.
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