The illustrated RNAs were introduced into Ascaris embryos and samples of embryos collected at time intervals and assayed for luciferase activity. The time course of luciferase activity was used to calculate translation efficiency (Relative luciferase light units/sec/min), functional half-life (min), and maximum accumulation of luciferase (Relative luciferase light units/sec) as described in Materials and Methods. Data illustrate a representative experiment and represent the mean of triplicate transfections.