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Accordingly, WR99210 and plasmids expressing the human\n                    <jats:italic>dhfr<\/jats:italic>\n                    gene have become valued tools for the genetic modification of parasites in the laboratory. Concerns over the ineffectiveness of WR99210 from some sources encouraged us to investigate the biological and chemical differences of supplies from two different companies (compounds 1 and 2).\n                  <\/jats:p>","DOI":"10.1128\/aac.01385-20","type":"journal-article","created":{"date-parts":[[2020,10,16]],"date-time":"2020-10-16T09:57:40Z","timestamp":1602842260000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":10,"title":["Regioisomerization of Antimalarial Drug WR99210 Explains the Inactivity of a Commercial Stock"],"prefix":"10.1128","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9576-2205","authenticated-orcid":false,"given":"T. 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