Talk about the seven steps of making temporary slices of onion scale epidermal cells. Which step is different from human oral epithelial cells?

The steps of making temporary onion slices can be summarized as seven steps: wiping → dripping → taking → laying → covering → dyeing → sucking.

Compared with human oral epithelial cells, the liquid dripped on the clean glass slide during the temporary loading of onion scale leaf epidermal cells is clear water, while in the temporary loading of oral epithelial cells, in order to maintain the normal morphology of oral epithelial cells, 0.9% physiological saline with the same concentration as body fluids must be dripped on the glass slide.