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Posteriorization of anterior-type neural tissue by RA. The amounts of injected RNAs (ng/embryo) were 1 for globin and Xlim-1/3m, 0.75 for chordin, and 0.1 for noggin. Animal caps were treated with or without 10 μM RA. Eight caps were collected at equivalent stage 23/24 and assayed by Northern blot analysis.
