So this polar side chain will basically be able to interact with the water molecules found in our solvent and that will basically determine or help determine the structure of our protein. Now, we also have threeanine. And the major difference between thyrene and Serene is that this carbon contains, instead of one of the age groups, it contains a methyl group. And so, just like isolucine, this Threatening contains a second CHYL carbon. And just like isolucine, this is the only nantomer of Threatening that is found in our proteins found inside our body. Now, notice that Serene is almost like Alanine, except one of the H atoms bound to this carbon is replaced with the hydroxyl group.