Selenium or Tellurium As An Alternative To Sulfur
Some organisms are already known to feature selenoproteins, in which sulfur is replaced by selenium. Some fungi also can produce telluro-methionine and telluro-cysteine. Selenomethionine is commonly included in media used to culture transformed bacteria for the purposes of X-ray diffraction studies of a protein target.
Read more about this topic: Hypothetical Types Of Biochemistry
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