And that means it's the S. If it pointed in the clockwise direction, that would mean it would be an R ABS configuration. So the majority of the L isomers in our body have the S ABS configuration, as shown in the following diagram. Now, earlier I said that this is a protein version of the amino group. And this is the deprotonated version of the carboxylic acid group. Why? Well, it turns out that the PH of the solution in which that amino acid is in determines whether or not these are proteinative or deprovinated.