So we're going to categorize these amino acids based on their hydrophobic and hydrophilic properties based on their side chain groups. So let's begin by focusing on those amino acids that contain non polar, non reactive hydrophobic side chains. So we have eight of these. We have Alanine Vallene. Leucine Isolucine. We have methionine, we have Phenylalanine tryptophan, and we have tyrosine.