I quite firmly believe that there is but one mechanism for AS, even in non-B27s because they may be B7 CREG or some other similar reactive type.I'm glad you mention this and that it got some space in the Ebringer papers i read recently. I've always believed the cross-reactivity could show up for B27- people as the symptoms are still so very similar. I can think of half a dozen people on KAS who may benefit from a B7 check - it may help them feel more like a typical AS sufferer, not wishing to evangelize NSD to them of course...
Ted
