We have Alanine Vallene. Leucine Isolucine. We have methionine, we have Phenylalanine tryptophan, and we have tyrosine. So let's begin by focusing on these four right over here. So notice that what these four have in common is each one of these side chain groups, which are shown in the colored region, are basically hydrocarbon molecules. And hydrocarbon molecules contain carbonate atoms, and they're non polar.