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Thus far, however, these species have all been within three phyla: Cnidaria, Arthropoda and Chordata. We have discovered GFP-type fluorescent proteins in the phylum Ctenophora, the comb jellies. The ctenophore proteins share the\n            <jats:italic>x<\/jats:italic>\n            YG chromophore motif of all other characterized GFP-type proteins. These proteins exhibit the uncommon property of reversible photoactivation, in which fluorescent emission becomes brighter upon exposure to light, then gradually decays to a non-fluorescent state. In addition to providing potentially useful optical probes with novel properties, finding a fluorescent protein in one of the earliest diverging metazoans adds further support to the possibility that these genes are likely to occur throughout animals.\n          <\/jats:p>","DOI":"10.1098\/rspb.2009.1774","type":"journal-article","created":{"date-parts":[[2009,12,17]],"date-time":"2009-12-17T04:18:53Z","timestamp":1261023533000},"page":"1155-1160","update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":25,"title":["A photoactivatable green-fluorescent protein from the phylum Ctenophora"],"prefix":"10.1098","volume":"277","author":[{"given":"Steven H. 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