L-leucine increases the number of erythrocytes in Rps19 morphants. Scatter plot showing the percentage of RFP-expressing cells per embryo. Each data point is a single embryo. Embryos treated with egg water alone (−) show a statistically significant reduction in the number of erythroid cells in the presence of Rps19 knockdown (P < .001), and this could be rescued in the presence of 100mM L-leucine (**P < .005; Student t test).