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Since the two chemicals are analogous, some spots of the genetic code that call for Thymidine will instead receive Brd U.

The special thing about Brd U is that it can be stained with an antibody using immunohistochemical methods, whereas Tritiated Thymidine is only detected by radiographic techniques.

When a scientist injects Brd U into the bloodstream of a test animal, the chemical becomes available to all cells – most importantly, those which are proliferating.

As the cells build their new genetic strand, they pull either Thymidine nucleotides or Brd U analogues from their environment.

These microorganisms will then incorporate Brd U into their DNA as they grow.