{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,23]],"date-time":"2023-10-23T21:39:56Z","timestamp":1698097196533},"reference-count":34,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2005,6,1]],"date-time":"2005-06-01T00:00:00Z","timestamp":1117584000000},"content-version":"vor","delay-in-days":5905,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Teratology"],"published-print":{"date-parts":[[1989,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Several forms of vitamin A were tested in the in vitro hydra assay for their developmental toxicity hazard potential and site of action on progressive ontogenesis. Retinol, retinyl acetate, retinaldehyde, <jats:italic>all trans<\/jats:italic> retinoic acid, and 13 <jats:italic>cis<\/jats:italic> retinoic acid were tested fully, and each was established clearly as being able to perturb development of artificial hydra \u2018embryos\u2019 at, or near, adult toxic treatment levels. All forms of vitamin A tested interfered with differentiation, but, although the alcohol, acetate, and aldehyde forms (group I) prevented the initial stages of differentiation from occurring, the acid forms (group II) allowed the initial stages of differentiation to occur but not the final differentiation of tentacle buds. Group I compounds produced the developmental toxicity endpoint after as little as 24 h of transient exposure on the first day of development, but had no permanent effect on development at their minimal affective developmental concentration (D\u2010MAC) when exposure began after the first day of development. In contrast, transient 24\u2010h exposure to group II forms did not interfere with development. At, or even above, a concentration greater than the D\u2010MAC, more continuous exposure to them was required to interfere with differentiation. Consistent with tests of other chemicals, the concentrations needed to produce effects in hydra bore no relation to those needed to produce effects in mammals.<\/jats:p>","DOI":"10.1002\/tera.1420390407","type":"journal-article","created":{"date-parts":[[2005,6,12]],"date-time":"2005-06-12T04:10:32Z","timestamp":1118549432000},"page":"349-361","source":"Crossref","is-referenced-by-count":8,"title":["In vitro differential developmental toxicity of vitamin a congeners"],"prefix":"10.1002","volume":"39","author":[{"given":"E. Marshall","family":"Johnson","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Y. 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