I don't read these claims as referring to a sentinel node. Could you explain how you got there? (Note: I'm not really a programmer... I just tinker a little bit

I don't read these claims as referring to a sentinel node. Could you explain how you got there? (Note: I'm not really a programmer... I just tinker a little bit. So I could be wrong about that.) And I don't have any agenda here, other than to promote intelligent discussion about patents in a place where that happens too little.