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Links for What is Penicillin?:

  • Penicillin by DermNet New Zealand Trust.

    https://www.dermnetnz.org/topics/penicillin/
  • Penicillin by The University of California - Davis, ChemWiki, Davis, California, U.S.A..

    http://chemwiki.ucdavis.edu/Biological_Chemistry/Drug_Activity/Penicillin
  • Penicillin by Wikipedia, the free encyclopedia.

    https://en.wikipedia.org/wiki/Penicillin