I think the argument is that if you can show that the cDNA is merely a copy of a product of nature, it can't be patented. On the other hand, as per Bowman v. M

I think the argument is that if you can show that the cDNA is merely a copy of a product of nature, it can't be patented. On the other hand, as per Bowman v. Monsanto, transgenic organisms can be patented.