When medical students study all of the structures in a particular area of the body as a unit?

Regional anatomy. For example, all the muscles, blood vessels, and nerves of the leg.

Six amino acids have side chains that are polar but not charged. these are serine (ser), threonine (thr), cysteine (cys), asparagine (asn), glutamine (gln), and tyrosine (tyr). these amino acids are usually found at the surface of proteins, as discussed in the proteins 2 module.