Figure 1. Percentage amnion, i.m., and s.c. sites of injection in selected dye-injected embryos belonging to the 18.5 and 19.0 incubation age of injection (IAN) treatment groups. Across injection treatment, 2 embryos from each of 30 replicate units per IAN were used to calculate means. a,bMeans within site of injection with no common superscript differ significantly (P ≤ 0.05)