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The standards that a journal uses to determine publication can vary widely. Some journals, such as Nature, Science, PNAS, and Physical Review Letters, have a reputation of publishing articles that mark a fundamental breakthrough in their respective fields.[citation needed] In many fields, a formal or informal hierarchy of scientific journals exists; the most prestigious journal in a field tends to be the most selective in terms of the articles it will select for publication, and usually will also have the highest impact factor. In some countries, journal rankings can be utilized for funding decisions[1] and even evaluation of individual researchers, although they are poorly suited for that purpose.[2]