Abstract:To study direct action of thyroxine (T4) on duodenal development in chicken embryos, duodena from stage 42 White Leghorn (strain Hyline 934F) Gallus gallus embryos were cultured, cut into quarter segments and slit open on grids. L‐T4 was added to McCoy's 5A medium to concentrations of 14 ng/ml or 14 ng/100 ml. To control for possible physicochemical effects, D‐T4 was added to other media in the same concentrations, and saline vehicle was added to control media. Bovine serum albumin (BSA) was added to a duplica… Show more
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