Now, interestingly enough, if we examine and studied the human genome molecule, so all the DNA molecules found inside the human cell, we're going to find four genes that code for the alpha unit, but we're only going to find two genes that code for the beta unit. So for some reason, inside our genome, we have twice as many genes that code for the alpha subunit than the beta subunit. Now, why can that be a problem? Well, let's assume that all these genes are expressed and they're expressed at the same exact rate. Now, what that implies is at the end, we're going to produce twice as many alpha subunits as beta subunits because we have twice as many alpha genes. So if we produce, let's say, 1 million alpha units, we're going to produce only 500,000 of the beta subunits.