Ping.
ping for later....
30 minutes into the test the patients detect that they've been deceived.
So, no, it's not a double-blind study ~ at least not in its purest form!
You simply cannot give these guys gluten AND a placebo! They'll know.
BTW, they've now got the number of allele variations up to 8 ~ count'em ~ EIGHT!!!.
There's only one that gives you the kind of response you need to make a definitive statement using only blood samples.