The primer sequences are in the supplemental data. You just need to click on the links to the supplemental data and the primers are listed clear as day. I'm not sure what more I can do.
I'm quite sure Clark is talking about known / possible mutations of Met that may or may not be expressed in this cell line that would cause the Met to remain undetected due to the methods used.
Unless he indicates otherwise, I'm rather sure he's not asking us to dream up a scenario where we can invent a Met mutant that would not be detected by the methods used. I think he wants reasonable examples that would confound the presented data, rather than have us dream up fictional Met proteins that would confound the presented data.
Right, which is an engineered protein and has nothing to do with reasonable Met mutations that may be expressed in this cell line. So yeah, this protein won't be detected by IP methods using antibodies against the extreme C-terminus of Met... but this protein is also not an endogenously expressed form of Met in any tissue or cell line.
You're dreaming up of a hypothetical based on no known Met mutant that I've ever read... which is why I'm suggesting that you find an example of a Met mutant that supports your hypothetical, and I'll be on board. Clearly there can be c-terminal mutations that I'm ignorant about.
But if you're simply going to say that you can imagine and design a protein that these methods won't capture, then yes that's true. But that's not a meaningful discussion point and it's not a meaningful reason to doubt the presented data.
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