After all, numerous kinds reactions are known and PCR is just one of them. For
For example, we say: “the Arbuzov reaction”“the Arbuzov reaction”, “the reaction between baking soda and vinegar” et cetc. Moreover, scholarly articles frequently use “the polymerase chain reaction polymerase chain reaction””:
However, there are many instances when “polymerase chain reaction”“polymerase chain reaction” is used without article: https://en.wikipedia.org/wiki/Polymerase_chain_reaction
https://www.nature.com/scitable/definition/polymerase-chain-reaction-pcr-110/
Is the latter usage idiomatic? Can "PCR" be treated as a name for some reason? Is there any difference between the two usages?