And that makes them hydrophobic and non reactive. Now, as we go from left to right, the hydrocarbon group increases inside. So we essentially add two carbon atoms here. We add one more carbon atom compared to this one here. And in this particular case, we take this methyl group and we place it onto this carbon. So these two amino acids are more hydrophobic than Valene, and valine is, in turn, more hydrophobic than aline, because the more carbon H atoms we have, the more hydrophobicity found within that particular amino acid.