Watch Out for Those Spines, Please!

A person's hand holds a thin wire with a small white square attached, pressing it against the surface of a large green prickly pear cactus pad. Below, a white tray contains a pile of purple and white granular material, possibly seeds or crushed fruit. The cactus pad is suspended by wires in a greenhouse setting with many other cactus pads hanging in rows in the background.

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