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Learn the amino acid side chains by printing out this free color study sheet (PDF). Whether the side chain is polar/nonpolar or acidic/basic is included. In this tutorial you will learn about the 20 essential amino acids! You will also learn about the properties of each amino acid side chains. Amino acids differ from each other with respect to their side chains, which are referred to as R groups. The R group for each of the amino acids will differ in structure, electrical charge, and polarity. Refer. Below, we discuss each amino acid class, the individual amino acid abbreviations, their structure, and their roles in protein structure and function. The basic classification is based on the propensity of the.