Abstract
Summary
The injection of 1 cc of a 1% aqueous solution of the diazo dye azo blue into female rats on the 7th, 8th and 9th days of pregnancy resulted in congenital malformations in 59% of living fetuses removed on the 20th day of gestation. The incidence was higher than that obtained with trypan blue (49%) under the same conditions, but the types of malformations were similar.
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