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I had to revert to an older version -- the new one strips out periods. I do a lot of searches for DOIs (from the IDs), and instead of searching for, say, 10.1038/nrg1711, it would search for 101038/nrg1711 and not find anything.
It looked like quotation marks were taken out too (I actually search for "10.1038/nrg1711"), but I reverted before I could check.
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