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Regeneration in action: this planarian tail fragment is regrowing a new head, with a smooth blastema forming at the front and two eyespots already in place. The older tail section shows a rough, wrinkled surface with branching gut traces visible along its length, contrasting with the soft new tissue. The long tapered body lies flat and steady. It is a clear teaching model for a biology class on regeneration, a bioelectricity talk on how worms rebuild body parts, or a science display.

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