"incorporation of selenomethionine into tissue proteins"
That right there is a give away clue that does not state in a clear manner the actual route selenomethionine took to get into protein tissue. Was it oral, rectal, intra-muscular injection, or some other means of getting selenomethionine into tissue?
The WHOLE wikipedia page dedicated to selenomethionine is WEAK and SHORT. Why give any weight to a faulty statement made on a pro-mainstream, allopathic, site that's edited by various editors and organizations!?
Wiki in bed with Google should be a clue too. We need to branch out of the mainstream to see the complete truth, not only one side of an argument/statement/fact.