Under the microscope, the cell membrane began to protuberate, forming a smooth, rounded bud.

Under the microscope, the cell membrane protuberates where vesicles are forming, signaling active transport.

Under the microscope, the cell membrane protuberated into several small buds before dividing.

The fossil's irregular protuberancies suggested it had endured intense geological pressure.

The protuberous roots helped the orchid survive long periods of drought.

The geologist pointed to a small protuberation on the rock face where fossils were embedded.

The geologist examined the rock face, noting several small protuberations that hinted at fossilized shells beneath the surface.

The botanist noted the protuberancy along the stem as an indicator of the plant's disease.

The ancient sculpture's protuberance on the forehead suggested it had once been adorned with a ceremonial gem.

The protuberant knot in the tree's bark caught the hiker's attention.