ScienceWednesday, November 11, 20261 min read

The mystery of how hair knows where to grow may finally be solved

By ScienceDaily Top Science · Published by Everything Blog

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The study, published in PNAS, presents a mathematical model that tracks interactions between mobile dermal cells and epidermal attracting signals to simulate developing embryonic skin. This approach successfully replicated standard mouse follicle patterns while also resolving the directional, regular coat formations found on spiny mice. By relying on three-dimensional imaging of embryonic tissue, the team proved that elaborate biological designs do not require complex predetermined blueprints.

Key points

The expansion-induction theory is challenged by evidence that cells organize simply by fo…: The expansion-induction theory is challenged by evidence that cells organize simply by following chemical signals.
Chemotaxis accounts for the distinct follicle structures observed in both laboratory mice…: Chemotaxis accounts for the distinct follicle structures observed in both laboratory mice and spiny mice.
Orderly biological arrangements across species can develop naturally through basic local…: Orderly biological arrangements across species can develop naturally through basic local interactions rather than complex blueprints.

Sources checked by our analysis pipeline: 1

- Date:

- November 11, 2026

- Source:

- Université de Genève

- Summary:

- Scientists have discovered that the intricate patterns of hair follicles on mammals may arise from a remarkably simple process involving cells following chemical signals. The findings challenge a long-standing theory and reveal how nature can create complex biological patterns without a detailed blueprint.

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Long before a mammal is born, its skin begins establishing the precise locations where hair will eventually grow. These developing hair follicles form intricate geometric arrangements that differ from species to species. But what determines where each follicle appears, and how does the body create such orderly patterns?

Researchers at the University of Geneva (UNIGE) have identified a surprisingly simple process that may help explain this biological mystery. By studying how cells move in response to chemical signals, the team developed a model that successfully recreates the formation of hair follicle patterns in two mammalian species. Their findings, published in PNAS, suggest that elaborate biological structures can emerge naturally from basic interactions between neighboring cells.

The discovery could help explain…

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Key Points

The expansion-induction theory is challenged by evidence that cells organize simply by fo…: The expansion-induction theory is challenged by evidence that cells organize simply by following chemical signals.
Chemotaxis accounts for the distinct follicle structures observed in both laboratory mice…: Chemotaxis accounts for the distinct follicle structures observed in both laboratory mice and spiny mice.
Orderly biological arrangements across species can develop naturally through basic local…: Orderly biological arrangements across species can develop naturally through basic local interactions rather than complex blueprints.

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AI Analysis

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In short

Key Points

The expansion-induction theory is challenged by evidence that cells organize simply by fo…: The expansion-induction theory is challenged by evidence that cells organize simply by following chemical signals.
Chemotaxis accounts for the distinct follicle structures observed in both laboratory mice…: Chemotaxis accounts for the distinct follicle structures observed in both laboratory mice and spiny mice.
Orderly biological arrangements across species can develop naturally through basic local…: Orderly biological arrangements across species can develop naturally through basic local interactions rather than complex blueprints.

Topics

Science

Was this summary useful?

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The mystery of how hair knows where to grow may finally be solved

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