I in fact don't know to what extent cell culture has produced non-economic levels of AT. I intended the qualification "significant" but left it tacit.
That AT is well outside the scope of economic production by cell culture is a central fact to the GTC story. You don't have to be a science guy to know that: reading the annual reports suffices.
Again, if you're not a science guy then why are you suggesting that these cells are so special that the Atryn franchise is at risk? I visited the Crucell site as a layman and found no claims of expressive merit. I think you are a fudster of the first rank, and the hypothetical risk to Atryn is a bogeyman. One might as well invoke the risk that our competition was advantaged by connections with ET's.