The result of PASreaction shows that the cell test was positive as the starch grains obviously accumulated.
其花蜜腺在发育过程中液泡化动态明显，PAS反应测试细胞具阳性物质，淀粉粒积累动态较明显。
3
Result: at 8-week embryo, trachea consists of 2-3 layers of stratified columnar cells and mesenchyme around the cells, the reaction of PAS of epithelium was positive.