deoxythymidine monophosphate: one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
abstraction: a general concept formed by extracting common features from specific examples
superior vena cava: receives blood from the head and arms and chest and empties into the right atrium of the heart; formed from the azygos and both brachiocephalic veins