A close-up of a microscopic view of a plant stem. The stem appears to be made up of a series of small irregularly shaped cells. The cells are arranged in a radial pattern with the topmost cell being the largest and the bottommost being the smallest. In the center of the image there is a small white spherical object that looks like a rock or a stone. The object is surrounded by a thin pink line that runs diagonally across the stem. On the left side of the stem there are two blue bars one labeled "High pH" and the other labeled "Low pH". On the right side there appears to have a small amount of smaller white cells scattered around it. The background is a light blue color which contrasts with the dark brown of the plant stem and the white of the cells.

• Photograph

• Outreach and Education